using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Display the n terms of even natural number and their sum");

        Console.WriteLine("Enter a n term ");

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

        int sum=0;

        Console.Write("The Even Natural Number is ");

        for(int i=1;i<=n*2;i++)

        {       

            if(i%2==0)

            {

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

                sum = sum+i;

            }           

        }

        Console.WriteLine();

        Console.WriteLine("The Sum of even Natural Number upto {0} terms {1}",n,sum);

    }

}