#include <cstdio>
#include <iostream>
using namespace std;

int main() {
	long N, ans = 1;
	cin >> N;
	bool a = false;
	for (long i = 2; i <= N; i++) {
		ans *= i;
		if (1000000000000 <= ans) {
			ans %= 1000000000000;
			a = true;
		}
	}
	if (a) printf("%012ld", ans);
	else cout << ans;
}