using System;

public class Program

{

    public static void Main()

    {

            int chips = 21;

            int chipsTurn = 0;

            Boolean winner = false;

            Random rnd = new Random();

            int player = rnd.Next(2);

​

            if (player == 1) { 

                chipsTurn = rnd.Next(1, 3);

                chips -= chipsTurn;

                Console.WriteLine("The computer takes {0} chips", chipsTurn);

                Console.WriteLine("Chips left on table: " + chips);

                player = 0;

​

            }

​

            while (chips !=0) {

​

                if (player==0)

                {

                    player = 1;

                    int trueinput = 0;

                    while (trueinput==0)

                    {  

                        Console.WriteLine("Take 1  2  or 3 chips ");

                        chipsTurn = int.Parse(Console.ReadLine());

                      if (chipsTurn >0 && chipsTurn <4 && chipsTurn<=chips)

                        {

                            chips = chips-chipsTurn;

                           trueinput = 1;

                        }

                        else {

                            Console.WriteLine("Wrong Input!!");

                        }

​

                    }

​

                    Console.WriteLine("There are {0} chips left on the table\n\n", chips);

                    Console.WriteLine();

​

                     if (chips == 0) {

                        winner = true;

                    }

​

                }

​

                else

​

                {   if (chips > 3)

                    {

                          chipsTurn = rnd.Next(1, 3);

​

​

                    }

                    else {

                        chipsTurn = chips;

                    }

                    chips -= chipsTurn;

​

                    Console.WriteLine("computer takes {0} chips", chipsTurn);

                    Console.WriteLine("There are {0} chips left on the table\n\n", chips);

​

                    player = 0;

                }

​

            }

​

            if (winner)

            {

                Console.WriteLine("Congrats! You won.");

            }

            else {

                Console.WriteLine("You lost.");

​

            }

​

​

​

​

        }

    }

​

​