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

int main()
{
	long long n;
	cin >> n;

	if (n >= 50)cout << "000000000000" << endl;
	else {
		long long a = 1;
		for (long long i = 1; i <= n; i++) {
			a *= i;
			a %= (long long)(1e12);
		}
		cout << a << endl;
	}

    return 0;
}