//=====================================
// title: 階乘(循環方法Iterative Implementation)
// author: cjj
// date: 2007-09-29
//=====================================
#include <iostream>
using namespace std;

int main()
{
	for (int n; cin >> n;)
	{
		int factory = 1;
		if (n == 0)
			cout << n << "! = " << 1 << endl;
		else
		{
			for (int i = 1; i <= n; i++)
			{
				factory *= i;
			}
			cout << n << "! = " << factory << endl;
		}
	}
	return 0;
}