cleaning

using System;

namespace cleaning
{
    public class cleaning
    {
        public static void Main(string[] args)
        {
            double a = double.Parse(Console.ReadLine());
            double b = double.Parse(Console.ReadLine());
            double c = double.Parse(Console.ReadLine());
            double d = double.Parse(Console.ReadLine());
            double time = 1 / (1 / a + 1 / b + 1 / c);
            double totalTime = time * 1.15;
            double timeLeft = d - totalTime;
            if (timeLeft > 0)
            {
                Console.WriteLine($"Cleaning time: {totalTime:f2}");
                Console.WriteLine($"Yes, there is a surprise - time left -> {Math.Floor(timeLeft)} hours.");
            }
            else
            {
                Console.WriteLine($"Cleaning time: {totalTime:f2}");
                Console.WriteLine($"No, there isn't a surprise - shortage of time -> {Math.Ceiling(Math.Abs(timeLeft))} hours.");
            }
        }
    }
}