public static void Main()
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());
Console.WriteLine("the average is "+sum/4);