diff --git a/done.txt b/done.txt
index 410338e..bcdb380 100644
--- a/done.txt
+++ b/done.txt
@@ -284,4 +284,7 @@ Decrypt String from Alphabet to Integer Mapping
 Minimum Number of Operations to Make X and Y Equal
 Maximize Sum Of Array After K Negations
 Check if Strings Can be Made Equal With Operations I
-Maximum Length of Subarray With Positive Product
\ No newline at end of file
+Maximum Length of Subarray With Positive Product
+Island Perimeter
+Number of Senior Citizens
+Longest Substring with At Least K Repeating Characters
\ No newline at end of file