using System;

public class Program

{

    public static void Main()

    {

     int a,b,c,d;

    int sum;

    Console.WriteLine("enter a number");

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

    Console.WriteLine("enter b number");

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

    Console.WriteLine("enter c number");

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

    Console.WriteLine("enter d number");

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

    sum=a+b+c+d;

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

    Console.WriteLine("the average is "+sum/4);

    }

}