using System;

namespace Three_Brothers
{
    class Program
    {
        static void Main(string[] args)
        {
            double brother1 = double.Parse(Console.ReadLine());
            double brother2 = double.Parse(Console.ReadLine());
            double brother3 = double.Parse(Console.ReadLine());
            double timeAvail = double.Parse(Console.ReadLine());

            double totalTime = 1 / (1 / brother1 + 1 / brother2 + 1 / brother3);
            totalTime += totalTime * 0.15;
            Console.WriteLine($"Cleaning time: {totalTime:f2}");

            double timeLeft = timeAvail - totalTime;

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