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

namespace _02.Умната_Лили
{
    class Program
    {
        static void Main(string[] args)
        {
            var age = int.Parse(Console.ReadLine());
            var washingPrice = double.Parse(Console.ReadLine());
            var toyPrice = double.Parse(Console.ReadLine());
            double  moneyForBD = 10.0;
            double  toyCount = 0.0;
            double  savedMoney = 0.0;
            double  totalMoney = 0.0;

            for (int currAge = 1; currAge < age; currAge++)
            {
                if (currAge % 2 == 0)
                {
                    savedMoney += moneyForBD - 1;
                    moneyForBD += 10;
                }
                else toyCount++;
            }

            totalMoney = savedMoney + (toyPrice * toyCount);

            if (totalMoney >= washingPrice) Console.WriteLine("Yes!{0:f2}", totalMoney - washingPrice);
            else Console.WriteLine("No!{0:f2}", washingPrice - totalMoney);
        }
    }
}