Трима братя; Three brothers

using System;

namespace tESt
{
    class Program
    {
        static void Main(string[] args)
        {
            var brother_1 = double.Parse(Console.ReadLine());      // 3
            var brother_2 = double.Parse(Console.ReadLine());      // 4
            var brother_3 = double.Parse(Console.ReadLine());      // 5
            var fatherFishing = double.Parse(Console.ReadLine());  // 3.6

            var cleaningTime = 1 / ((1 / brother_1) + (1 / brother_2) + (1 / brother_3)) * 1.15;  // 15%

            var leftHours = fatherFishing - cleaningTime;
            Console.WriteLine($"Cleaning time: {cleaningTime:f2}");

            if (leftHours >= 0)
            {
                leftHours = Math.Floor(leftHours);
                Console.WriteLine($"Yes, there is a surprise - time left -> {leftHours} hours.");
            }
            else
            {
                leftHours = Math.Abs(leftHours);
                leftHours = Math.Ceiling(leftHours);
                Console.WriteLine($"No, there isn't a surprise - shortage of time -> {leftHours} hours.");
            }
        }
    }
}