#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <fstream>
#include <sstream>
#include<set>
#include<stack>
#include<time.h>
#include <sys/types.h>
#include <tuple>
#include <numeric>
#include <iterator>

typedef long long int ll;
//#include<bits/stdc++.h>


using namespace std;

ll gcd(ll a, ll b) {
    if (a < b)swap(a, b);
    if (b == 0)return a;
    return gcd(b, a % b);
}
int lcm(int a, int b) {
    return a * b / gcd(a, b);
}







int main()
{

    int Q;
    Q = 1;
    //cin >> Q;   

    while (Q--) {
        ll n;
        cin >> n;
        if (n >= 50)cout << "000000000000";
        else {
            ll m = 1000000000000;
            ll x = 1;
            for (ll i = 1; i <= n; i++) {
                x *= i;
                x %= m;
            }
            if (n <= 14) {
                cout << x;
            }
            else {
                ll t = 100000000000;
                while (x < t) {
                    cout << 0; t /= 10;
                }
                cout << x;
            }
        }
    }
        return 0;
}