diff --git a/src/week4/BOJ3015/BOJ3015_V1.cpp b/src/week4/BOJ3015/BOJ3015_V1.cpp
new file mode 100644
index 0000000..641b340
--- /dev/null
+++ b/src/week4/BOJ3015/BOJ3015_V1.cpp
@@ -0,0 +1,33 @@
+#include <bits/stdc++.h>
+using namespace std;
+int n;
+long long int ret, temp;
+stack<pair<long long int, long long int>> s;
+int main() {
+
+    ios_base::sync_with_stdio(false);
+    cin.tie(NULL);
+    cout.tie(NULL);
+
+    cin >> n;
+
+    for (int i = 0; i < n; i++) {
+        cin >> temp;
+        int cnt = 1;
+        while (s.size() && s.top().first <= temp) {
+            ret += s.top().second;
+            if (s.top().first == temp) {
+                cnt = s.top().second + 1;
+            } else {
+                cnt = 1;
+            }
+            s.pop();
+        }
+
+        if (s.size()) ret++;
+        s.push({temp,cnt});
+    }
+
+    cout << ret << '\n';
+    return 0;
+}
\ No newline at end of file