using System;

public class Program

{

    public static void Main()

    {

        string kettle;

        string pass = "No";

        do

        {

            Console.WriteLine("Has the Kettle boiled? Yes or No");

            kettle = Console.ReadLine();

            if (kettle =="Yes")

            {

                Console.WriteLine("Please add 200ml of water to your cup");

                pass = "Yes";

            }

            else if (kettle == "No")

            {

                Console.WriteLine("Please wait for the Kettle to boil.");

            }

        } while (pass == "No");

    }

}