Умната Лили

using System;

namespace tESt
{
    class Program
    {
        static void Main(string[] args)
        {
            var yearsLily = int.Parse(Console.ReadLine());


            var priceWashMachine = double.Parse(Console.ReadLine());
            var toyPrice = double.Parse(Console.ReadLine());

            var moneyBurtDay = 10;
            var money = 10;
            var toys = 1;



            if (yearsLily < 2)
            {

                var toysMony = toys * toyPrice;
                var budget = toysMony ;
                var buyWashMachine = budget - priceWashMachine;

                if (buyWashMachine > 0)
                {
                    Console.WriteLine($"Yes! {buyWashMachine:f2}");
                }
                else if (buyWashMachine == 0)
                {
                    Console.WriteLine("Yes!");
                }
                else
                {
                    buyWashMachine = Math.Abs(buyWashMachine);
                    Console.WriteLine($"No! {buyWashMachine:f2}");
                }


            }

            else
            {
                for (int i = 2; i < yearsLily; i++)    //    3td burday  + 1 toy
            {

                if (i % 2 == 0)  // EVEN Years
                {
                    toys = toys + 1;
                }
                else            //  ODD Years
                {
                    moneyBurtDay = +(moneyBurtDay + 10);
                    money = money + moneyBurtDay - 1;

                }
            }

            var toysMony = toys * toyPrice;
            var budget = money + toysMony - 1;  // for second year brother -1
            var buyWashMachine = budget - priceWashMachine;

            if (buyWashMachine > 0)
            {
                 Console.WriteLine($"Yes! {buyWashMachine:f2}");
            }
            else if (buyWashMachine == 0)
            {
                 Console.WriteLine("Yes!");
            }
            else
            {
                 buyWashMachine = Math.Abs(buyWashMachine);
                 Console.WriteLine($"No! {buyWashMachine:f2}");
            }


            }
        }
    }
}