using System;

public class Program

{

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

            { 

              double ans = (a+b+c+d)/4;

              return ans;

            }

    public static void Main()

    {

        Console.WriteLine("Please enter the four values to find the average of");

        double num1 = double.Parse(Console.ReadLine());

        double num2 = double.Parse(Console.ReadLine());

        double num3 = double.Parse(Console.ReadLine());

        double num4 = double.Parse(Console.ReadLine());

        Console.WriteLine("The average of " + num1 + ", " + num2 + ", " + num3 + " and " + num4 + " is " + average(num1, num2, num3, num4));

    }

}