#include <iostream>
#include <vector>
#include <utility>
#include <algorithm>
#include <string>
#include <stack>
using ll = long long;
#define MOD 1000000007
using namespace std;

int main(){
    ll N, ans = 1;
    cin >> N;
    if (N>50) {
        cout << "000000000000";
    }
    else {
        for(int i = 2; i <= N; i++)
        {
            ans *= i;
            ans %= 1000000000000;
        }
        cout << ans << endl;
    }
    return 0;
}