diff --git a/src/cds/src/main/kotlin/org/icpclive/api/Scoreboard.kt b/src/cds/src/main/kotlin/org/icpclive/api/Scoreboard.kt
index 3c9a92569..c639d3e15 100644
--- a/src/cds/src/main/kotlin/org/icpclive/api/Scoreboard.kt
+++ b/src/cds/src/main/kotlin/org/icpclive/api/Scoreboard.kt
@@ -2,8 +2,7 @@ package org.icpclive.api
 
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
-import org.icpclive.util.DurationInMillisecondsSerializer
-import org.icpclive.util.DurationInMinutesSerializer
+import org.icpclive.util.*
 import kotlin.time.Duration
 
 @Serializable
@@ -26,7 +25,7 @@ data class ScoreboardRow(
     val teamId: Int,
     val rank: Int,
     val totalScore: Double,
-    @Serializable(with = DurationInMinutesSerializer::class)
+    @Serializable(with = DurationInSecondsSerializer::class)
     val penalty: Duration,
     val lastAccepted: Long,
     val medalType: String?,
diff --git a/src/cds/src/main/kotlin/org/icpclive/cds/atcoder/AtcoderDataSource.kt b/src/cds/src/main/kotlin/org/icpclive/cds/atcoder/AtcoderDataSource.kt
new file mode 100644
index 000000000..0e749c275
--- /dev/null
+++ b/src/cds/src/main/kotlin/org/icpclive/cds/atcoder/AtcoderDataSource.kt
@@ -0,0 +1,140 @@
+package org.icpclive.cds.atcoder
+
+import kotlinx.datetime.*
+import kotlinx.serialization.Serializable
+import org.icpclive.api.*
+import org.icpclive.cds.common.*
+import org.icpclive.cds.common.ContestParseResult
+import org.icpclive.cds.common.FullReloadContestDataSource
+import org.icpclive.cds.common.jsonLoader
+import org.icpclive.cds.settings.AtcoderSettings
+import org.icpclive.util.*
+import kotlin.time.Duration
+import kotlin.time.Duration.Companion.ZERO
+import kotlin.time.Duration.Companion.minutes
+import kotlin.time.Duration.Companion.nanoseconds
+import kotlin.time.Duration.Companion.seconds
+
+@Serializable
+internal class AtcoderTask(
+    val Assignment: String,
+    val TaskName: String,
+    val TaskScreenName: String,
+)
+
+@Serializable
+internal class AtcoderTaskResult(
+    val Count: Int,
+    val Failure: Int,
+    val Penalty: Int,
+    val Score: Int,
+    val Elapsed: Long,
+    val Pending: Boolean,
+)
+
+@Serializable
+internal class AtcoderTeam(
+    val UserScreenName: String,
+    val TaskResults: Map<String, AtcoderTaskResult>
+)
+
+@Serializable
+internal class ContestData(
+    val TaskInfo: List<AtcoderTask>,
+    val StandingsData: List<AtcoderTeam>
+)
+
+internal class AtcoderDataSource(val settings: AtcoderSettings) : FullReloadContestDataSource(5.seconds) {
+    val teamIds = Enumerator<String>()
+    val problemIds = Enumerator<String>()
+    private val loader = jsonLoader<ContestData>(settings.network, ClientAuth.CookieAuth("REVEL_SESSION", settings.sessionCookie)) { "https://atcoder.jp/contests/${settings.contestId}/standings/json" }
+
+    var submissionId: Int = 1
+    val runs = mutableMapOf<Pair<Int, Int>, List<RunInfo>>()
+
+    fun addNewRuns(teamId: Int, problemId: Int, result: AtcoderTaskResult) : List<RunInfo> {
+        val oldRuns = (runs[teamId to problemId] ?: emptyList()).toMutableList()
+        repeat(result.Count - oldRuns.size) {
+            oldRuns.add(
+                RunInfo(
+                    id = submissionId++,
+                    result = null,
+                    percentage = 0.0,
+                    problemId = problemId,
+                    teamId = teamId,
+                    time = minOf(settings.contestLength, Clock.System.now() - settings.startTime)
+                )
+            )
+        }
+        while (oldRuns.count { (it.result as? IOIRunResult)?.wrongVerdict != null } < result.Penalty) {
+            val fst = oldRuns.indexOfFirst { it.result == null }
+            oldRuns[fst] = oldRuns[fst].copy(result = IOIRunResult(score = listOf(0.0), wrongVerdict = Verdict.Rejected))
+            if (result.Elapsed.nanoseconds != ZERO && oldRuns[fst].time > result.Elapsed.nanoseconds) {
+                oldRuns[fst] = oldRuns[fst].copy(time = result.Elapsed.nanoseconds)
+            }
+        }
+        if (result.Score > 0) {
+            if (oldRuns.mapNotNull { it.result as? IOIRunResult }.maxOfOrNull { it.score[0] }?.toInt() != result.Score / 100 && !result.Pending) {
+                val fst = oldRuns.indexOfFirst { it.result == null }
+                oldRuns[fst] = oldRuns[fst].copy(result = IOIRunResult(score = listOf(result.Score / 100.0)), time = result.Elapsed.nanoseconds)
+            }
+        }
+        return oldRuns
+    }
+
+    override suspend fun loadOnce(): ContestParseResult {
+        val data = loader.load()
+        val problems = data.TaskInfo.mapIndexed { index, task ->
+            ProblemInfo(
+                letter = task.Assignment,
+                name = task.TaskName,
+                id = problemIds[task.TaskScreenName],
+                ordinal = index,
+                contestSystemId = task.TaskScreenName,
+                minScore = 0.0,
+                maxScore = (data.StandingsData.maxOfOrNull { it.TaskResults[task.TaskScreenName]?.Score ?: 0 } ?: 0) / 100.0,
+                scoreMergeMode = ScoreMergeMode.LAST_OK
+            )
+        }
+        val teams = data.StandingsData.map {
+            TeamInfo(
+                id = teamIds[it.UserScreenName],
+                fullName = it.UserScreenName,
+                displayName = it.UserScreenName,
+                contestSystemId = it.UserScreenName,
+                groups = emptyList(),
+                hashTag = null,
+                medias = emptyMap(),
+                isHidden = false,
+                isOutOfContest = false,
+                organizationId = null,
+            )
+        }
+        val info = ContestInfo(
+            name = "",
+            status = ContestStatus.byCurrentTime(settings.startTime, settings.contestLength),
+            resultType = ContestResultType.IOI,
+            startTime = settings.startTime,
+            contestLength = settings.contestLength,
+            freezeTime = settings.contestLength,
+            problemList = problems,
+            teamList = teams,
+            groupList = emptyList(),
+            organizationList = emptyList(),
+            penaltyRoundingMode = PenaltyRoundingMode.LAST,
+            penaltyPerWrongAttempt = 5.minutes,
+        )
+        val newRuns = buildList {
+            for (teamResult in data.StandingsData) {
+                val teamId = teamIds[teamResult.UserScreenName]
+                for ((problemCdsId, problemResult) in teamResult.TaskResults) {
+                    val problemId = problemIds[problemCdsId]
+                    runs[teamId to problemId] = addNewRuns(teamId, problemId, problemResult).also {
+                        addAll(it)
+                    }
+                }
+            }
+        }
+        return ContestParseResult(info, newRuns, emptyList())
+    }
+}
\ No newline at end of file
diff --git a/src/cds/src/main/kotlin/org/icpclive/cds/common/NetworkUtils.kt b/src/cds/src/main/kotlin/org/icpclive/cds/common/NetworkUtils.kt
index b03846afd..e2941371d 100644
--- a/src/cds/src/main/kotlin/org/icpclive/cds/common/NetworkUtils.kt
+++ b/src/cds/src/main/kotlin/org/icpclive/cds/common/NetworkUtils.kt
@@ -7,6 +7,7 @@ import io.ktor.client.plugins.auth.*
 import io.ktor.client.plugins.auth.providers.*
 import io.ktor.client.request.*
 import org.icpclive.cds.settings.NetworkSettings
+import io.ktor.http.*
 import java.security.cert.X509Certificate
 import javax.net.ssl.X509TrustManager
 
@@ -16,6 +17,8 @@ internal sealed class ClientAuth {
 
     class OAuth(val token: String) : ClientAuth()
 
+    class CookieAuth(val name: String, val value: String): ClientAuth()
+
     companion object {
         fun BasicOrNull(login: String?, password: String?) = if (login != null && password != null) {
             Basic(login, password)
@@ -38,7 +41,13 @@ internal fun HttpClientConfig<*>.setupAuth(auth: ClientAuth) {
 
         is ClientAuth.OAuth -> {
             defaultRequest {
-                header("Authorization", "OAuth ${auth.token}")
+                header(HttpHeaders.Authorization, "OAuth ${auth.token}")
+            }
+        }
+
+        is ClientAuth.CookieAuth -> {
+            defaultRequest {
+                header(HttpHeaders.Cookie, "${auth.name}=${auth.value}")
             }
         }
     }
diff --git a/src/cds/src/main/kotlin/org/icpclive/cds/settings/CDSSettings.kt b/src/cds/src/main/kotlin/org/icpclive/cds/settings/CDSSettings.kt
index c22e0f457..7ff5be911 100644
--- a/src/cds/src/main/kotlin/org/icpclive/cds/settings/CDSSettings.kt
+++ b/src/cds/src/main/kotlin/org/icpclive/cds/settings/CDSSettings.kt
@@ -12,6 +12,7 @@ import kotlinx.serialization.properties.decodeFromStringMap
 import org.icpclive.api.ContestResultType
 import org.icpclive.cds.ContestUpdate
 import org.icpclive.cds.adapters.toEmulationFlow
+import org.icpclive.cds.atcoder.AtcoderDataSource
 import org.icpclive.cds.cats.CATSDataSource
 import org.icpclive.cds.clics.ClicsDataSource
 import org.icpclive.cds.clics.FeedVersion
@@ -27,6 +28,7 @@ import org.icpclive.cds.yandex.YandexDataSource
 import org.icpclive.util.*
 import java.io.InputStream
 import java.nio.file.Path
+import kotlin.time.Duration
 
 // I'd like to have them in cds files, but then serializing would be much harder
 
@@ -222,6 +224,21 @@ class CodeDrillsSettings(
     override fun toDataSource(creds: Map<String, String>) = CodeDrillsDataSource(this, creds)
 }
 
+@SerialName("atcoder")
+@Serializable
+class AtcoderSettings(
+    val contestId: String,
+    val sessionCookie: String,
+    @Serializable(with = HumanTimeSerializer::class)
+    val startTime: Instant,
+    @Serializable(with = DurationInSecondsSerializer::class)
+    @SerialName("contestLengthSeconds") val contestLength: Duration,
+    override val emulation: EmulationSettings? = null,
+    override val network: NetworkSettings? = null
+) : CDSSettings() {
+    override fun toDataSource(creds: Map<String, String>) = AtcoderDataSource(this)
+}
+
 @OptIn(ExperimentalSerializationApi::class)
 fun parseFileToCdsSettings(path: Path) : CDSSettings {
     val file = path.toFile()
diff --git a/src/cds/src/main/kotlin/org/icpclive/scoreboard/IOIScoreboardCalculator.kt b/src/cds/src/main/kotlin/org/icpclive/scoreboard/IOIScoreboardCalculator.kt
index 5abd7d49c..ea9b4cbfd 100644
--- a/src/cds/src/main/kotlin/org/icpclive/scoreboard/IOIScoreboardCalculator.kt
+++ b/src/cds/src/main/kotlin/org/icpclive/scoreboard/IOIScoreboardCalculator.kt
@@ -5,6 +5,7 @@ import org.icpclive.api.*
 internal class IOIScoreboardCalculator : AbstractScoreboardCalculator() {
     override val comparator: Comparator<ScoreboardRow> = compareBy(
         { -it.totalScore },
+        { it.penalty }
     )
 
     override fun ContestInfo.getScoreboardRow(
diff --git a/src/frontend/overlay/src/components/atoms/ContestCells.js b/src/frontend/overlay/src/components/atoms/ContestCells.js
index a968fa5ed..b6710666b 100644
--- a/src/frontend/overlay/src/components/atoms/ContestCells.js
+++ b/src/frontend/overlay/src/components/atoms/ContestCells.js
@@ -24,6 +24,21 @@ export const formatScore = (score, digits = 2) => {
     return score?.toFixed((score - Math.floor(score)) > 0 ? digits : 0);
 };
 
+export const formatPenalty = (contestInfo, penalty) => {
+    if (penalty === undefined) {
+        return "";
+    }
+    let mode = contestInfo.penaltyRoundingMode;
+    if (mode === "sum_in_seconds" || mode === "last") {
+        return Math.floor(penalty / 60) + ":" + (penalty % 60 < 10 ? "0" : "") + (penalty % 60);
+    } else {
+        return Math.floor(penalty / 60);
+    }
+};
+
+export const needPenalty = (contestInfo) => contestInfo?.penaltyRoundingMode !== "zero";
+
+
 export const ProblemCellWrap = styled(Cell)`
   border-bottom: ${props => props.probColor} ${CELL_PROBLEM_LINE_WIDTH} solid;
 `;
diff --git a/src/frontend/overlay/src/components/organisms/holder/TeamViewHolder.js b/src/frontend/overlay/src/components/organisms/holder/TeamViewHolder.js
index 7fe2c3915..4c52834aa 100644
--- a/src/frontend/overlay/src/components/organisms/holder/TeamViewHolder.js
+++ b/src/frontend/overlay/src/components/organisms/holder/TeamViewHolder.js
@@ -13,7 +13,7 @@ import {
 import { SCOREBOARD_TYPES } from "../../../consts";
 import { pushLog } from "../../../redux/debug";
 import { Cell } from "../../atoms/Cell";
-import { ProblemCell, RankCell, TextShrinkingCell } from "../../atoms/ContestCells";
+import { formatPenalty, needPenalty, ProblemCell, RankCell, TextShrinkingCell } from "../../atoms/ContestCells";
 import { StarIcon } from "../../atoms/Star";
 import { formatScore } from "../../atoms/ContestCells";
 import { ScoreboardIOITaskCell } from "../widgets/Scoreboard";
@@ -201,10 +201,10 @@ export const TeamInfo = ({ teamId }) => {
         <ScoreboardStatCell>
             {scoreboardData === null ? null : formatScore(scoreboardData?.totalScore, 1)}
         </ScoreboardStatCell>
-        {contestInfo?.resultType !== "IOI" &&
-        <ScoreboardStatCell>
-            {scoreboardData?.penalty}
-        </ScoreboardStatCell>}
+        {needPenalty(contestInfo) &&
+            <ScoreboardStatCell>
+                {scoreboardData === null ? null : formatPenalty(contestInfo, scoreboardData.penalty)}
+            </ScoreboardStatCell>}
 
     </TeamInfoWrapper>;
 };
diff --git a/src/frontend/overlay/src/components/organisms/widgets/PVP.js b/src/frontend/overlay/src/components/organisms/widgets/PVP.js
index 22abb4388..5ce0302f3 100644
--- a/src/frontend/overlay/src/components/organisms/widgets/PVP.js
+++ b/src/frontend/overlay/src/components/organisms/widgets/PVP.js
@@ -11,7 +11,7 @@ import {
 } from "../../../config";
 import { SCOREBOARD_TYPES } from "../../../consts";
 import { Cell } from "../../atoms/Cell";
-import { formatScore, RankCell, TextShrinkingCell } from "../../atoms/ContestCells";
+import { formatPenalty, formatScore, needPenalty, RankCell, TextShrinkingCell } from "../../atoms/ContestCells";
 import { StarIcon } from "../../atoms/Star";
 import { ScoreboardIOITaskCell } from "./Scoreboard";
 import { TeamWebRTCProxyVideoWrapper, TeamWebRTCGrabberVideoWrapper } from "../holder/TeamViewHolder";
@@ -231,9 +231,9 @@ const TeamInfo = ({ teamId }) => {
         <ScoreboardStatCell>
             {scoreboardData === null ? null : formatScore(scoreboardData?.totalScore, 1)}
         </ScoreboardStatCell>
-        {contestData.resultType !== "IOI" &&
+        {needPenalty(contestData) &&
             <ScoreboardStatCell>
-                {scoreboardData?.penalty}
+                {scoreboardData === null ? null : formatPenalty(contestData, scoreboardData.penalty)}
             </ScoreboardStatCell>}
 
     </TeamInfoWrapper>;
diff --git a/src/frontend/overlay/src/components/organisms/widgets/Scoreboard.js b/src/frontend/overlay/src/components/organisms/widgets/Scoreboard.js
index 11264588c..69762fcc9 100644
--- a/src/frontend/overlay/src/components/organisms/widgets/Scoreboard.js
+++ b/src/frontend/overlay/src/components/organisms/widgets/Scoreboard.js
@@ -20,7 +20,14 @@ import {
     VERDICT_UNKNOWN
 } from "../../../config";
 import { Cell } from "../../atoms/Cell";
-import { formatScore, ProblemCell, RankCell, TextShrinkingCell } from "../../atoms/ContestCells";
+import {
+    formatPenalty,
+    formatScore,
+    needPenalty,
+    ProblemCell,
+    RankCell,
+    TextShrinkingCell
+} from "../../atoms/ContestCells";
 import { StarIcon } from "../../atoms/Star";
 
 
@@ -221,8 +228,8 @@ export const ScoreboardRow = ({ teamId, hideTasks, rankWidth, nameWidth, sumPenW
         <ScoreboardStatCell width={sumPenWidth ?? SCOREBOARD_SUM_PEN_WIDTH}>
             {scoreboardData === null ? null : formatScore(scoreboardData.totalScore)}
         </ScoreboardStatCell>
-        {contestData?.resultType === "ICPC" && <ScoreboardStatCell width={sumPenWidth ?? SCOREBOARD_SUM_PEN_WIDTH}>
-            {scoreboardData?.penalty}
+        {needPenalty(contestData) && <ScoreboardStatCell width={sumPenWidth ?? SCOREBOARD_SUM_PEN_WIDTH}>
+            {scoreboardData === null ? null : formatPenalty(contestData, scoreboardData.penalty)}
         </ScoreboardStatCell>}
         {!hideTasks && scoreboardData?.problemResults.map((resultsData, i) =>
             <RenderScoreboardTaskCell key={i}  data={resultsData} minScore={contestData?.problems[i]?.minScore} maxScore={contestData?.problems[i]?.maxScore} />
@@ -244,7 +251,7 @@ const ScoreboardHeader = ({ problems, rowHeight, name }) => {
     return <ScoreboardHeaderWrap rowHeight={rowHeight}>
         <ScoreboardHeaderTitle color={color}>{nameTable[name]} STANDINGS</ScoreboardHeaderTitle>
         <ScoreboardHeaderStatCell>&#931;</ScoreboardHeaderStatCell>
-        {contestInfo?.resultType === "ICPC" && <ScoreboardHeaderStatCell>PEN</ScoreboardHeaderStatCell>}
+        {needPenalty(contestInfo) && <ScoreboardHeaderStatCell>PEN</ScoreboardHeaderStatCell>}
         {problems && problems.map((probData) =>
             <ScoreboardHeaderProblemCell key={probData.name} probData={probData} canGrow={true} canShrink={true}
                 basis={"100%"}/>