using System;

public class Program

{

    public static void Main()

    {

        string UserChoice="";

        do{

            Console.WriteLine("Please enter your target number");

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

            int Start = 0;

            while (Start <= UserTarget){

                Console.Write(Start + " ");

                Start = Start + 2;

            }

            do{

                Console.WriteLine("Do you want to continue - Yes or No?");

                UserChoice = Console.ReadLine().ToUpper();

                if (UserChoice != "YES" && UserChoice != "NO"){

                    Console.WriteLine("Invalid Choice, Please say Yes or No");

                }

            }

            while(UserChoice != "YES" && UserChoice != "NO");

            }

        while(UserChoice == "YES");

    }

}