using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.Write("n = ");

        string consoleInputLine = Console.ReadLine();

        int n = Convert.ToInt32(consoleInputLine);

        Console.Write("n! = ");

        decimal factorial = 1;

        //Perform an infinite loop

        while (true)

        {

            Console.Write(n);

            if (n == 1)

            {

                break;

            }

            Console.Write(" * ");

            factorial *= n;

            n--;

        }

        Console.Write(" = {0}", factorial);

    }

}

​