using System;

public class Program

{

    public static void Main()

    {

        Console.Write("Input value of N: ");

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

        while (N <= 1)

        {

            Console.Write("Input value of N, again: ");

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

        }

        Console.WriteLine();

        int sum1 = 0;

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

        {

            if (i%2 != 0)

            {

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

            sum1 = sum1 + i;    

            }

        }

        Console.WriteLine();

        Console.WriteLine("Summation of even number is {0}", sum1);

    }

}