using System;

namespace MyApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
            var projecthours = int.Parse(Console.ReadLine());
            var availabledays = int.Parse(Console.ReadLine());
            var overtimeWorkers = int.Parse(Console.ReadLine());

            double workDays = availabledays * 0.9;
            double overtimeHours = overtimeWorkers * workDays * 2;
            double workHours = overtimeHours + workDays * 8 * overtimeWorkers;
            double hoursDiff = Math.Floor(Math.Abs(projecthours - workHours));

            if (workHours >= projecthours)
            {
                Console.WriteLine("Yes!{0} hours left.", hoursDiff);
            }
            else
            {
                Console.WriteLine("Not enough time!{0} hours needed.",hoursDiff);
            }

        }
    }
}