#include<iostream>
#include<string>
using namespace std;
int main(){
    long long M;
    long long ans = 1;
    cin >> M;
    if(M >= 50) cout << "000000000000" << endl;
    else{
        for(long long i=2;i<=M;i++){
            ans = (ans*i)%(1000000000000);
        }
        cout << ans << endl;
    }
    return 0;
}