using System;

public class Program

{

    public static void Main()

    {

        string first;

        string second;

        string third;

        string fourth;

        double avg;

        Console.WriteLine("Enter 1st number");

            first=Console.ReadLine();

        Console.WriteLine("Enter 2nd number");

            second=Console.ReadLine();

        Console.WriteLine("Enter 3rd number");

            third=Console.ReadLine();

        Console.WriteLine("Enter 4th number");

            fourth=Console.ReadLine();

        avg = double.Parse(first);

        avg += double.Parse(second);

        avg += double.Parse(third);

        avg += double.Parse(fourth);

        avg = avg/4;

        Console.WriteLine($"the average of your 4 numbers is {avg:f2}");

    }

}