using System;

public class Program

{

    private static double averange (double a, double b, double c, double d)

{

     double mean = a + b + c + d /4; 

    return ans;

    }

    public static void Main()

    {

        Console.WriteLine("Please enter 4 numbers");

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

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

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

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

        Console.WriteLine("The averange of all 4 numbers is " + ans); 

    }

}

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