using System;

public class Program

{

    public static void Main()

    {

        var n = 0;

        while (true)

        {

            Console.Write("Enter even number; ");

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

            if (n % 2 == 0)

                break; // chetno chislo- izhod ot cikala

            Console.WriteLine("The number is not even.");

        }

        Console.WriteLine("Even number entered: {0}", n);

    }

}