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