#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;

#define rep(i,a,b) for(int i=a;i<b;i++)

const int inf = 1001001000;
//const int mod = 1000000007;
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};

int digitsum(int i){
    int t = i;
    int ret = 0;
    while(t){
        ret += t%10;
        t /= 10;
    }
    return ret;
}
long long mod = pow(10,12);
long long factorial(int n){
    long long ret = 1;
    for(int i = 1; i < n+1; i++){
        ret *= i;
        ret %= mod;
    }
    return ret;
}


int main(){
 
    int n;
    cin >> n;

    if(n < 50){
        cout << factorial(n) << endl;
    }else{
        cout << "000000000000" << endl;
    }

}