Smart Lilly

using System;

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

            var even = 0.0;
            var evenR = 0.0;
            var brother = 0;
            var odd = 0.0;

            for (int i = 1; i <= age; i++)
            {
                if (i%2==0)
                {
                    brother++;
                    even += 10;
                    evenR += even;
                }
                else
                {
                    odd++;
                }
            }
            var allSum = (priceToy*odd)+(evenR - brother);
            var testForWE = allSum - priceWashEngine;
            if (testForWE>=0)
            {
                Console.Write("Yes! ");
                Console.WriteLine($"{testForWE:f2}");
            }
            else
            {
                var middCalc = Math.Abs(testForWE);
                Console.Write("No! ");
                Console.WriteLine($"{middCalc:f2}");
            }
        }
    }
}