diff --git a/week2/11399ATM/solution.py b/week2/11399ATM/solution.py
index e69de29..471d1ac 100644
--- a/week2/11399ATM/solution.py
+++ b/week2/11399ATM/solution.py
@@ -0,0 +1,19 @@
+def main():
+    N = int(input())
+    times = list(map(int, input().split()))
+    times.sort()
+
+    waitings = [0] * len(times)
+
+    for i, time in enumerate(times):
+        if i==0:
+            waitings[i] += time
+            continue
+        waitings[i] += (waitings[i-1] + time)
+    
+    print(sum(waitings))
+
+
+
+if __name__=='__main__':
+    main()
\ No newline at end of file