diff --git "a/pu2rile/\354\212\244\355\203\235/\354\240\234\353\241\234.py" "b/pu2rile/\354\212\244\355\203\235/\354\240\234\353\241\234.py"
new file mode 100644
index 0000000..f02b9be
--- /dev/null
+++ "b/pu2rile/\354\212\244\355\203\235/\354\240\234\353\241\234.py"
@@ -0,0 +1,9 @@
+k = int(input())
+stack = []
+for _ in range(k):
+  n = int(input())
+  if n == 0:
+    stack.pop()
+  else:
+    stack.append(n)
+print(sum(stack))
\ No newline at end of file