using System;

​

public class Program

{

    public static void Main()

    {

        int givenhours = int.Parse(Console.ReadLine());

        int daysgiven = int.Parse(Console.ReadLine());

        int numemployees = int.Parse(Console.ReadLine());

​

        double learning, hours, neededhours;

        learning = (daysgiven - (daysgiven * 0.1)) * 8;

        hours = numemployees * (2 * daysgiven) + learning;

        if(hours > givenhours)

        {   double left;

            left = hours - givenhours;

            Console.WriteLine("Yes!{0} hours left.", Math.Floor(left));

        }

        else if (hours < givenhours) 

        {

            neededhours = givenhours - hours;

            Console.WriteLine("Not enough time!{0} hours needed.", givenhours);

        }

    }

}