using System;

public class Program

{

static int factorial(int x)

{

int f=1;

for (int i=1;i<=x;i++)

f=f*i;

return f;

}

static int factorial2(int x)

{

if (x<=0)

return 1;

return x*factorial2(x-1);

}

    public static void Main()

    {

Console.WriteLine("Enter The Number :");

int x=Convert.ToInt32(Console.ReadLine());

Console.WriteLine("!"+x+" ="+factorial(x));

Console.WriteLine("Enter The Number :");

int y=Convert.ToInt32(Console.ReadLine());

Console.WriteLine("!"+y+" ="+factorial2(y));

    }

}