using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

    using System;

namespace ConsolApplication

{

class Programm

{

static void Main (string [] args)

{

int [] number = { 1, 2, 3, 4, 5, 6, 7}; 

int sum =0;

sum = (number [1] +number [5]) /2;

Console.Writeline (sum);

}

}

}