#include <iostream>
using namespace std;
typedef long long int ll;
const ll MOD = 1000000007;
ll n, ans = 1;
int main() {
	cin >> n;
	if (n >= MOD)cout << 0 << endl;
	else {
		for (int i = 1; i <= n; i++)ans = (ans*i) % MOD;
		cout << ans << endl;
	}
	return 0;
}