#include <iostream>
#include <string>
#include <assert.h>
using namespace std;


using ll = unsigned long long int;

int main(void){
    
    ll n;
    cin >> n;
    
    if(n >= 100){
        cout << 0 << endl;
        return 0;
    }
    
    ll res = 1;
    
    for(int i = 1; i <= n; i++){
        res *= i;
        res %= 1000000000000;
        //cout << i << " " << res << endl;
    }
    
    cout << res << endl;
    
    return 0;
    
}