using System;

public class Program

{

    public static void Main()

    {

        var first = () => 3;

        var second = () => 5;

        var third = () => 9;

        var progress = new Progress(17);

        progress.GetProgressHandlers += () => 3;

        progress.GetProgressHandlers += second;

        progress.GetProgressHandlers += third;

        Console.WriteLine(progress.Report());

    }

    private class Progress

    {

        public delegate int GetProgress();

​

        public GetProgress GetProgressHandlers;

​

        public int Total { get; }

​

        public Progress(int total)

        {

            Total = total;

        }

​

        public float Report()

        {

            int current = 0;

            current = GetProgressHandlers.Invoke();

            return current / (float)Total;

        }

    }

}