Simple_Loops_UmnataLily

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

namespace _15_exam3_SmartLily
{
    class Program
    {
        static void Main(string[] args)
        {
            double age = double.Parse(Console.ReadLine());
            double laundryPrice = double.Parse(Console.ReadLine());
            double gamePrice = double.Parse(Console.ReadLine());
            double money = 0.0;

            for (int i = 1; i <= age; i++)
            {
                if (i % 2 == 0)
                {
                    money += ((i / 2.0) * 10 - 1);
                }
                else
                {
                    money += gamePrice;
                }
            }
            double diff = Math.Abs(money - laundryPrice);
            if (money >= laundryPrice)
            {
                Console.WriteLine($"Yes! {diff:f2}");
            }
            else
            {
                Console.WriteLine($"No! {diff:f2}");
            }
        }
    }
}