Smart Lily

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

namespace SmartLilly
{
    class Program
    {
        static void Main(string[] args)
        {
            int LiliAge = int.Parse(Console.ReadLine());
            double washingMashinePrice = double.Parse(Console.ReadLine());
            int priceOfToys = int.Parse(Console.ReadLine());

            var moneyForBirhday = 10.0;
            var savedMoney = 0.0;
            var numberOfToys = 0.0;
            var moneyForToys = 0.0;
            var totalMoney = 0.0;

            for (int i = 1; i <= LiliAge ; i++)
            {
                if (i % 2 ==0)
                {
                    savedMoney += (moneyForBirhday - 1);
                    moneyForBirhday += 10;

                }
                else
                {
                    numberOfToys = numberOfToys + 1;
                    moneyForToys = numberOfToys * priceOfToys;
                }

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