using System;

public class Program

{

    public static void Main()

    {

        int i, n=8, s=0;

        int[] a =new int[n];

        for (i= 0; i<n; i++)

            {

                Console.WriteLine("въведи число");

            a[i] = int.Parse(Console.ReadLine());

    }

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

        {

            s=s+a[i];

            Console.WriteLine(a[i]);

        }

         Console.WriteLine("s="+s);

    }

}