diff --git a/.vscode/launch.json b/.vscode/launch.json
index 2d68418..f260dec 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -1,5 +1,26 @@
 {
     "configurations": [
+        {
+            "type": "java",
+            "name": "U4_L1_Activity_Three",
+            "request": "launch",
+            "mainClass": "Unit4.U4_L1_Activity_Three",
+            "projectName": "my-app"
+        },
+        {
+            "type": "java",
+            "name": "U4_L1_Activity_Two",
+            "request": "launch",
+            "mainClass": "Unit4.U4_L1_Activity_Two",
+            "projectName": "my-app"
+        },
+        {
+            "type": "java",
+            "name": "U4_L1_Activity_One",
+            "request": "launch",
+            "mainClass": "Unit4.U4_L1_Activity_One",
+            "projectName": "my-app"
+        },
         {
             "type": "java",
             "name": "Assignment3",
diff --git a/src/main/java/Unit4/U4_L1_Activity_One.java b/src/main/java/Unit4/U4_L1_Activity_One.java
new file mode 100644
index 0000000..607b503
--- /dev/null
+++ b/src/main/java/Unit4/U4_L1_Activity_One.java
@@ -0,0 +1,20 @@
+package Unit4;
+
+import java.util.Scanner;
+
+public class U4_L1_Activity_One {
+    public static void main(String[] args){
+        Scanner scanner = new Scanner(System.in);
+
+        int num=0;
+        System.out.println("Enter any numbers (Enter 5 to stop)");
+        int sum=0;
+        while (num!=5){
+            sum+=num;
+            num=scanner.nextInt();
+        }
+
+        System.out.println("Sum is "+sum);
+        scanner.close();
+    }
+}
diff --git a/src/main/java/Unit4/U4_L1_Activity_Three.java b/src/main/java/Unit4/U4_L1_Activity_Three.java
new file mode 100644
index 0000000..f9d457d
--- /dev/null
+++ b/src/main/java/Unit4/U4_L1_Activity_Three.java
@@ -0,0 +1,24 @@
+package Unit4;
+
+import java.util.Scanner;
+
+public class U4_L1_Activity_Three {
+    public static void main(String[] args){
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println("Input a word:");
+        String word =scanner.nextLine();
+
+        int index=0;
+        while (index<word.length()){
+            
+            if((index+1)%3!=0 && index<word.length()){
+                System.out.print(word.substring(index, index+1));
+            }
+
+            index++;
+        }
+
+        scanner.close();
+    }
+}
diff --git a/src/main/java/Unit4/U4_L1_Activity_Two.java b/src/main/java/Unit4/U4_L1_Activity_Two.java
new file mode 100644
index 0000000..d6282f8
--- /dev/null
+++ b/src/main/java/Unit4/U4_L1_Activity_Two.java
@@ -0,0 +1,21 @@
+package Unit4;
+
+import java.util.Scanner;
+
+public class U4_L1_Activity_Two {
+    public static void main(String[] args){
+        Scanner scanner = new Scanner(System.in);
+
+        int largest=0;
+        int num=0;
+        while (num!=-1){
+            num = scanner.nextInt();
+            if(largest<num){
+                largest=num;
+            }
+        }
+
+        System.out.println("The largest score is "+largest);
+        scanner.close();
+    }
+}