'commit'

TangDou/LuoGuBook/P5739.cpp

@@ -0,0 +1,15 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int f(int n) {
+    if (n == 1) return 1;
+    return n * f(n - 1);
+}
+
+int main() {
+    int n;
+    cin >> n;
+    cout << f(n) << endl;
+    return 0;
+}