using System;

namespace Harvest
{
    class Program
    {
        static void Main(string[] args)
        {
            int X = int.Parse(Console.ReadLine());
            double Y = double.Parse(Console.ReadLine());
            int Z = int.Parse(Console.ReadLine());
            int workersCount = int.Parse(Console.ReadLine());

            double totalGrapse = X * Y;
            double wine = (0.4 * totalGrapse) / 2.5;
            if (wine >= Z)
            {
                double wineLeft = wine - Z;
                double wineFor1Worker = wineLeft / workersCount;
                Console.WriteLine($"Good harvest this year! Total wine: {wine} liters.");
                Console.WriteLine($"{wineLeft} liters left -> {wineFor1Worker} liters per person.");

            }
            else if (wine < Z)
            {
                double wineLeft = Z - wine;
                Console.WriteLine($"It will be a tough winter! More {Math.Abs(wineLeft)} liters wine needed.");

            }

        }
    }
}