using System;

public class Program

{

    public static void Main()

    {

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

        int sum = 0;

        Console.Write("The even numbers are: ");

        for(int i = 1; i <= num; i ++)

        {

            if(i % 2 == 0)  

            {

                sum = sum + i;

                Console.Write("{0}, ",i);

            }

        }

        //Console.WriteLine();

        Console.WriteLine("\nThe Sum of even Natural Number upto {0} terms : {1}",num,sum);

    }

}