#include <iostream>
using namespace std;

using ll = long long;

int main(){
	long long x;
	cin >> x;
	if(1e9 + 7 <= x){
		cout << 0 << endl;
		return 0;
	}
	ll ans = 1;
	for(ll i = 1; i <= x; i++) (ans *= i) %= ll(1e9 + 7);
	cout << ans << endl;
}