using System;

public class ThreeBrothers
{
    public static void Main()
    {
        var firstBrTime = double.Parse(Console.ReadLine());
        var secondBrTime = double.Parse(Console.ReadLine());
        var thirdBrTime = double.Parse(Console.ReadLine());
        var fishingTime = double.Parse(Console.ReadLine());

        var totalTime = 1 / (1 / firstBrTime + 1 / secondBrTime + 1 / thirdBrTime);
        var restTime = totalTime * 0.15;
        var cleaningTime = totalTime + restTime;
        var timeLeft = fishingTime - cleaningTime;

        Console.WriteLine($"Cleaning time: {cleaningTime:F2}");

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