using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AdvancedLoops
{
    class AdvancedLoops
    {
        static void Main(string[] args)
        {
            int n;

            do
            {
                try
                {
                    n = int.Parse(Console.ReadLine());

                    if (n % 2 == 0)
                    {
                        break;
                    }

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

                    n = int.Parse(Console.ReadLine());
                }
                catch (Exception)
                {
                    Console.WriteLine("Invalid number!");
                }
            } while (true);

            Console.WriteLine($"Even number entered {n}");
        }
    }
}