#include <bits/stdc++.h>
using namespace std;

int main() {
    int64_t n;
    cin >> n;
    if (n >= 50) {
        puts("000000000000");
        return 0;
    }
    bool big = false;
    int64_t ans = 1;
    for (int i = 1; i <= n; i++) {
        ans *= i;
        if (ans >= 1000000000000) big = true;
        ans %= 1000000000000;
    }
    if (big) {
        printf("%012d\n", ans);
    } else {
        printf("%d\n", ans);
    }
}