#include <future>
#include <iostream>

using namespace std;
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);

	unsigned long long int x;
	cin >> x;

	unsigned long long int res = 1;
	
	for (int i = x; i > 0; i--)
	{
		res *= i;
		res %= 1000000007;
	}
	cout << res << "\n";

	return 0;
}