diff --git a/Luogu/B3872/B3872.cpp b/Luogu/B3872/B3872.cpp
new file mode 100644
index 00000000..0f1e66de
--- /dev/null
+++ b/Luogu/B3872/B3872.cpp
@@ -0,0 +1,48 @@
+#include <iostream>
+#include <algorithm>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 505;
+
+int n, ans;
+bool t[N];
+
+struct node {
+    int t, r;
+} a[N];
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n;
+
+    for (int i = 1; i <= n; i++) {
+        cin >> a[i].t;
+    }
+
+    for (int i = 1; i <= n; i++) {
+        cin >> a[i].r;
+    }
+
+    std::sort(a + 1, a + 1 + n, [&](const node &a, const node &b) {
+        return a.r > b.r;
+    });
+
+    for (int i = 1; i <= n; i++) {
+        for (int j = a[i].t; j; j--) {
+            if (!t[j]) {
+                t[j] = true;
+                ans += a[i].r;
+                break;
+            }
+        }
+    }
+
+    cout << ans << endl;
+
+    return 0;
+}