diff --git a/AcWing/4/4.cpp b/AcWing/4/4.cpp
new file mode 100644
index 00000000..bb23189b
--- /dev/null
+++ b/AcWing/4/4.cpp
@@ -0,0 +1,35 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 505,
+          M = 6005;
+
+int n, m, v[N], w[N], s[N], f[M], ans;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+
+    cin >> n >> m;
+    for (int i = 1; i <= n; i++) {
+        cin >> v[i] >> w[i] >> s[i];
+    }
+
+    for (int i = 1; i <= n; i++) {
+        for (int k = 1; k <= s[i]; k++) {
+            for (int j = m; j >= v[i]; j--) {
+                f[j] = std::max(f[j], f[j - v[i]] + w[i]);
+            }
+        }
+    }
+
+    for (int i = 0; i <= m; i++) {
+        ans = std::max(ans, f[i]);
+    }
+
+    cout << ans << endl;
+
+    return 0;
+}