#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <string>
#include <sstream>
#include <cmath>
#include <stack>
#include <cctype>
#include <stdio.h>

using namespace std;

int main() {

	int n = 0;
	cin >> n;

	stringstream ss;

	long long sum = 1;
	if (n < 50) {
		for (int i = 1; i <= n; i++) {
			sum = sum * i % 10000000000000;
		}
		ss<<sum;
		string s = ss.str();
		if(sum >=1000000000000){
		s.erase(0,1);
		}
		cout<<s<<endl;
	}else {
		cout<<"000000000000"<<endl;
	}

	return 0;
}