Nim game

You are encouraged to solve this task according to the task description, using any language you may know.
Nim is a simple game where the second player ─── if they know the trick ─── will always win.



The game has only 3 rules:

   start with   12   tokens
   each player takes   1,  2,  or  3   tokens in turn
  the player who takes the last token wins.


To win every time,   the second player simply takes 4 minus the number the first player took.   So if the first player takes 1,   the second takes 3 ─── if the first player takes 2,   the second should take 2 ─── and if the first player takes 3,   the second player will take 1.



Task

Design a simple Nim game where the human player goes first, and the computer always wins. The game should enforce the rules.




 
using System;
 
namespace nimGame
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("There are twelve tokens.\n" +
                    "You can take 1, 2, or 3 on your turn.\n" +
                    "Whoever takes the last token wins.\n");
 
            int tokens = 12;
 
            while (tokens > 0)
            {
                Console.WriteLine("There are " + tokens + " remaining.");
                Console.WriteLine("How many do you take?");
                int playertake = Convert.ToInt32(Console.ReadLine());
 
                if (playertake < 1 | playertake > 3)
                {
                    Console.WriteLine("1, 2, or 3 only.");
                }
                else
                {
                    tokens -= playertake;
                    Console.WriteLine("I take " + (4 - playertake) + ".");
                    tokens -= (4 - playertake);
                }
            }
            Console.WriteLine("I win again.");
            Console.ReadLine();
        }
 
    }
}
 