create dev channel

zeta/py/completed/10773.py

@@ -0,0 +1,13 @@
+def solve(K, I):
+    stack = list()
+    for i in I:
+        if i:
+            stack.append(i)
+        else:
+            stack.pop()
+    return sum(stack)
+
+
+if __name__ == '__main__':
+    K = int(input())
+    print(solve(K, [int(input()) for _ in range(K)]))