using System;

​

public class Program

{

    public static void Main()

    {

        int num, count;

        Console.WriteLine("enter num");

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

        count = 0;

        while (count <= num)

        {

            Console.WriteLine(count);

            count = count + 2;

        }

​

        Console.ReadLine();

    }

}