#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <string>
#include <sstream>
#include <cmath>
#include <stack>
#include <cctype>
using namespace std;

int main() {

	int n = 0;
	cin >> n;

	long long sum = 1;
	if (n < 50) {
		for (int i = 1; i <= n; i++) {
			sum = sum * i % 1000000000000;
		}
		cout << sum << endl;
	}else {
		cout<<"000000000000"<<endl;
	}

	return 0;
}