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


using ll = unsigned long long int;

int main(void){
    
    ll n;
    cin >> n;
    
    ll res = 1;
    
    for(int i = 1; i <= n; i++){
        if(i >= 1000000){
            res %= 1000000;
            res *= (i%1000000);
        }else
        res *= i;
        res %= 1000000000000;
    }
    
    cout << res << endl;
    
}