#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <math.h>
#include <cmath>
#include <limits.h>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <functional>
#include <stdio.h>
using namespace std;

long long MOD = 1000000007;

int main() {
    
    long long N;
    cin >> N;
    
    long long x = 1;
    for ( long long i = 1; i <= N; i++ ) {
        x *= i;
        x %= 1000000000000;
        if ( !x ) { break; }
    }
    
    cout << x << endl;
    
    return 0;
}