diff --git a/hadongun/README.md b/hadongun/README.md
index 9ecb9dc..633408d 100644
--- a/hadongun/README.md
+++ b/hadongun/README.md
@@ -9,5 +9,6 @@
  | 5차시 | 2025.04.02 |  스택  | [스택2](https://www.acmicpc.net/problem/28278)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/20|
  | 6차시 | 2025.04.04 |  정렬  | [단어 정렬](https://www.acmicpc.net/problem/1181)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/21|
  | 7차시 | 2025.04.07 |  스택  | [균형 잡힌 세상](https://www.acmicpc.net/problem/4949)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/25|
-
+ | 8차시 | 2025.04.09 |  그리디 알고리즘  | [알바생 강호](https://www.acmicpc.net/problem/1758)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/29|
+ | 9차시 | 2025.05.02 |  스택  | [제로](https://www.acmicpc.net/problem/10773)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/36|
  ---
\ No newline at end of file
diff --git "a/hadongun/\354\212\244\355\203\235/\354\240\234\353\241\234.py" "b/hadongun/\354\212\244\355\203\235/\354\240\234\353\241\234.py"
new file mode 100644
index 0000000..fbe4f1c
--- /dev/null
+++ "b/hadongun/\354\212\244\355\203\235/\354\240\234\353\241\234.py"
@@ -0,0 +1,16 @@
+import sys
+stack = []
+k = int(input())
+for i in range(k):
+    N = int(sys.stdin.readline())
+    if N != 0:
+        stack.append(N)
+    else:
+        if stack:
+            stack.pop()
+Sum = 0
+temp = 0
+while stack:
+    temp = stack.pop()
+    Sum = Sum + temp
+print(Sum)