using System;

public class Program

{

    static private double avg(double n1, double n2, double n3, double n4)

    {

        double addi = n1 + n2 + n3 + n4;

        return addi / 4;

    }

    public static void Main()

    {

        Console.WriteLine("num1");

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

        Console.WriteLine("num2");

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

        Console.WriteLine("num3");

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

        Console.WriteLine("num4");

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

        Console.WriteLine(avg(num1,num2,num3,num4));

    }

}

​

​

​