Clever Lily

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

namespace DomashnoCleverLili
{
    class Program
    {
        static void Main(string[] args)
        {
            // get input --> int age, double washinMashinePrice, double oneToyPrice

            int age = int.Parse(Console.ReadLine());
            double washingMashinePrice = double.Parse(Console.ReadLine());
            double oneToyPrice = double.Parse(Console.ReadLine());


            // determen variables --> accumulate toy, moneySum

            int accumulateToyNumber = 0;

            double moneySum = 0;


            // how many toys

            for (int i = 0; i <= age; i++)
            {
                if (i % 2 == 1)
                {
                    accumulateToyNumber++;
                }
            }


            // how much money

            for (int i = 1; i <= age; i++)
            {

                if (i % 2 == 0)
                {
                    moneySum += i / 2 * 10;
                    moneySum--;
                }
            }

            // all money and are they enough

            double allMoneySum = moneySum + (oneToyPrice * accumulateToyNumber);

            double printEnough = allMoneySum - washingMashinePrice;

            double printNotEnough = washingMashinePrice - allMoneySum;

            // print result

            if (allMoneySum >= washingMashinePrice)
            {
                Console.WriteLine($"Yes! {printEnough:f2}");
            }
            else
            {
                Console.WriteLine($"No! {printNotEnough:f2}");
            }
        }
    }
}