using System;

namespace For_Cycle
{
    class Program
    {
        static void Main(string[] args)
        {
                int age = int.Parse(Console.ReadLine());
                double priceOfWashingMachine = double.Parse(Console.ReadLine());
                double priceofOneToy = double.Parse(Console.ReadLine());

            int toysCounter = 0;
            double moneyHolder = 0;
            int stolenMoney = 0;
            double moneyPresent = 0;

            for (int currentYear = 1; currentYear <= age; currentYear++)
            {
                if (currentYear % 2 != 0)
                {
                    toysCounter++;
                }
                else
                {
                    stolenMoney++;
                    moneyHolder = moneyPresent;
                    moneyPresent += 10;
                }
            }

            double moneyFromToys = toysCounter * priceofOneToy;

            double finalResult = (moneyHolder + moneyFromToys) - stolenMoney;



            if (finalResult >= priceOfWashingMachine)
            {
                Console.WriteLine($"Yes! ({(finalResult - priceOfWashingMachine):f2})");
            }
            else
            {
                Console.WriteLine($"No! {(priceOfWashingMachine - finalResult):f2}");
            }
        }
    }
}