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

namespace _04UmnataLili
{
    class Program
    {
        static void Main(string[] args)
        {
            byte age = byte.Parse(Console.ReadLine());
            double washingMachines = double.Parse(Console.ReadLine());
            int priceGames = int.Parse(Console.ReadLine());
            int evenCount = 0;
            int oddCount = 0;
            int sum = 0;
            int sum1 = 0;
            int endSum = 0;
            for (int i = 1; i <= age; i++)
            {
                if (i % 2 == 0)
                {
                    sum += 10;
                    evenCount++;
                    sum1 += sum;
                }
               else
                {
                    oddCount++;
                }

            }
            endSum = (sum1 - evenCount) + (oddCount * priceGames);

            if (endSum >= washingMachines)
            {
                Console.WriteLine("Yes! {0:F2}",(endSum - washingMachines));
            }
            else
            {
                Console.WriteLine("No! {0:F2}",(washingMachines - endSum));
            }
        }
    }
}