04. Smart Lily

using System;

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);
        }
    }
}