#include <iostream>

int Factorial(int Num);

using namespace std;

int main()
{
	int x;
	cout << "Please enter a number: ";	cin >> x;
	cout << "The factorial of "<< x << " is " << Factorial(x) << "." << endl;
}

int Factorial(int Num)
{
	if (Num<=1)
		return 1;
	else
		return Factorial(Num-1)*Num;
}