12. Clever Lily

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

namespace _12.Clever_Lily
{
    class Program
    {
        static void Main(string[] args)
        {
            int age = int.Parse(Console.ReadLine());
            double priceWashingMachine = double.Parse(Console.ReadLine());
            int priceToy = int.Parse(Console.ReadLine());

            int toyCount = 0;
            int moneyCount = 0;
            int totalMoney = 0;
            int stolenMoney = 0;

            for (int i = 1; i <= age; i++)
            {
                if (i % 2 == 0)
                {
                    moneyCount += 10;
                    totalMoney += moneyCount;
                    stolenMoney++;
                }
                else
                {
                    toyCount++;
                }
            }

            double soldToys = toyCount * priceToy;

            double finalPrice = (totalMoney + soldToys) - stolenMoney;

            if (finalPrice >= priceWashingMachine)
            {
                Console.WriteLine($"Yes! {finalPrice - priceWashingMachine:F2}");
            }
            else
            {
                double diff =Math.Abs(priceWashingMachine - finalPrice);
                Console.WriteLine($"No! {diff:F2}");
            }
        }
    }
}