using System;

public class Program

{

    public static void Main()

    {

        Random rando = new Random();

        bool playerTurn = rando.Next(2) == 0;

        int aiPick;

        int chipsLeft = 21;

        while(chipsLeft > 0)

        {

                if(playerTurn)

                {

                    Console.WriteLine("Player 1's turn:");

                    Console.WriteLine("Please pick up to 3 chips");

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

                    chipsLeft -= aiPick;

                    Console.WriteLine("Player 1 picked {0} chips! There are {1} left.",

                                  aiPick, chipsLeft);

            }

            else

            {

                aiPick = rando.Next(3)+1;

                chipsLeft -= aiPick;

                Console.WriteLine("The AI picked {0} chips! There are {1} left.",

                                  aiPick, chipsLeft);

            }

            playerTurn = !playerTurn;

        }

        if(playerTurn)

        {

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

        }

        else

        {

            aiPick = rando.Next(3)+1;

        }

    }

}