Three Brothers

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DomashnoThreeBrothers
{
    class Program
    {
        static void Main(string[] args)
        {
            // get times of the three brothers and father gone time

            double TimeNeedToCleanFirstBrother = double.Parse(Console.ReadLine());
            double TimeNeedToCleanSecondBrother = double.Parse(Console.ReadLine());
            double TimeNeedToCleanThirdBrother = double.Parse(Console.ReadLine());
            double TimeGoneFather = double.Parse(Console.ReadLine());

            // define percent of time for relax

            double PercentOfTimeForRelax = 15;

            // calculate cleaning time needed

            double TimeNeedToCleenAllBrothers = 1 / (1 / TimeNeedToCleanFirstBrother + 1 / TimeNeedToCleanSecondBrother + 1 / TimeNeedToCleanThirdBrother);
            double TimeNeedToCleanAllBrothersWithRelax = TimeNeedToCleenAllBrothers + (TimeNeedToCleenAllBrothers * 1.00 * PercentOfTimeForRelax / 100);

            // deside if the time is enough and print result

            Console.WriteLine($"Cleaning time: {TimeNeedToCleanAllBrothersWithRelax:F2}");
            double TimeDifference = TimeGoneFather-TimeNeedToCleanAllBrothersWithRelax;
            if (TimeDifference >= 0)
            {
                double TimeLeft = Math.Floor(TimeDifference);
                Console.WriteLine($"Yes, there is a surprise - time left -> {TimeLeft} hours.");
            }
            else
            {
                double TimeNotEnough = Math.Ceiling(TimeDifference*(-1));
                Console.WriteLine($"No, there isn't a surprise - shortage of time -> {TimeNotEnough} hours.");
            }

        }
    }
}