Clever Lilly

using System;

namespace Clever_Lilly
{
    class Program
    {
        static void Main(string[] args)
        {
            int age = int.Parse(Console.ReadLine());
            double priceWashingMachine = double.Parse(Console.ReadLine());
            int priceForOneToy = int.Parse(Console.ReadLine());

            int toysCounter = 0;
            int savedMoney = 0;
            int stolenMoney = 0;
            int prevBirthday = 0;

            for (int currentBirthday = 1; currentBirthday <= age; currentBirthday++)
            {
                if (currentBirthday % 2 != 0 )
                {
                    toysCounter++;
                }
                else
                {
                    savedMoney += 10;
                    prevBirthday += savedMoney;
                    stolenMoney++;
                }
            }

            int totalMoneyFromToys = priceForOneToy * toysCounter;
            int totalSavedMoney = (prevBirthday + totalMoneyFromToys) - stolenMoney;

            if (priceWashingMachine <= totalSavedMoney)
            {
                Console.WriteLine($"Yes! {Math.Abs(priceWashingMachine - totalSavedMoney):f2}");
            }
            else
            {
                Console.WriteLine($"No! {Math.Abs(totalSavedMoney - priceWashingMachine):f2}");
            }
        }
    }

}