diff --git a/H0ngJu/README.md b/H0ngJu/README.md
index 756797b..c36db45 100644
--- a/H0ngJu/README.md
+++ b/H0ngJu/README.md
@@ -35,3 +35,4 @@
 | 31차시 | 2024.10.05 |   정렬   |                    [선 긋기](https://www.acmicpc.net/problem/2170)                    | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/249 |
 | 32차시 | 2024.10.14 | 이분 탐색 |                   [기타 레슨](https://www.acmicpc.net/problem/2343)                   | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/252 |
 | 33차시 | 2024.11.08 | 백트래킹 | [병원 거리 최소화](https://www.codetree.ai/training-field/frequent-problems/problems/min-of-hospital-distance/submissions?page=11&pageSize=5) | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/253 |
+| 34차시 | 2024.11.19 |  누적합  |                   [개똥벌레](https://www.acmicpc.net/problem/3020)                    |
diff --git "a/H0ngJu/\353\210\204\354\240\201\355\225\251/\352\260\234\353\230\245\353\262\214\353\240\210.py" "b/H0ngJu/\353\210\204\354\240\201\355\225\251/\352\260\234\353\230\245\353\262\214\353\240\210.py"
new file mode 100644
index 0000000..ba4b587
--- /dev/null
+++ "b/H0ngJu/\353\210\204\354\240\201\355\225\251/\352\260\234\353\230\245\353\262\214\353\240\210.py"
@@ -0,0 +1,33 @@
+import sys
+
+def input() : return sys.stdin.readline().rstrip()
+
+N, H = map(int, input().split())
+# N <= 200000, H<= 500000
+# 석순, 종유석, 석순, 종유석 ...
+up = [0 for _ in range(H+1)]
+down = [0 for _ in range(H+1)]
+min_broke = 1e9
+broke_cnt = 0
+
+for i in range(N):
+    info_h = int(input())
+    if i % 2 == 0:
+        down[info_h] += 1
+    else:
+        up[info_h] += 1
+
+for i in range(H-1, 0, -1):
+    down[i] += down[i+1]
+    up[i] += up[i+1]
+
+for i in range(1, H+1):
+    broke = up[i] + down[H-i+1]
+    if broke < min_broke:
+        min_broke = broke
+        broke_cnt = 1
+    elif broke == min_broke:
+        broke_cnt += 1
+
+print(min_broke, broke_cnt)
+