#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

int main(){
    long N;
    cin >> N;
    if(N >= 100){
        cout << 0 << endl;
        return 0;
    }
    long ans = 1;
    for(int i = 1; i <= N; i++){
        ans = ans * i % long(1e12);
    }
    cout << ans << endl;
}