using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp27
{
    class Program
    {
        static void Main(string[] args)
        {
            int lilyAge = int.Parse(Console.ReadLine());
            double washingMachinePrice = double.Parse(Console.ReadLine());
            int toyPrice = int.Parse(Console.ReadLine());
            double birthdayMoney = 10;
            double sumOfMoney = 0;

            double amountOfToys = 0;

            for (int i = 1; i <= lilyAge; i++)
            {
                if (i % 2 == 0)
                {
                    sumOfMoney = sumOfMoney + birthdayMoney -1;
                    birthdayMoney += 10;
                }
                if (i % 2 != 0)
                {
                    amountOfToys += 1;
                }
            }

            double totalMoney = sumOfMoney + (amountOfToys * toyPrice);

            if (totalMoney >= washingMachinePrice)
            {
                double moneyLeft = totalMoney - washingMachinePrice;
                Console.WriteLine($"Yes! {moneyLeft:F2}");
            }
            else if (totalMoney < washingMachinePrice)
            {
                double moneyShort = washingMachinePrice - totalMoney;
                Console.WriteLine($"No! {moneyShort:F2}");
            }
        }
    }
}