using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello world,this is my code:");

        int RecursionAnswer = 0;

        RecursionAnswer = Factorial(3);

        Console.WriteLine("Factorial Answer Is: " + RecursionAnswer);

    }

    private static int Factorial(int FactorialNum)

    {

        if (FactorialNum == 1)

            return 1;

        return FactorialNum * Factorial(FactorialNum - 1);

    }

}