04. Back To The Past

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

namespace BackToThePast
{
    class BackToThePast
    {
        static void Main(string[] args)
        {
            var money = double.Parse(Console.ReadLine());
            var year = int.Parse(Console.ReadLine());
            double result = money;
                for (int i = 1800; i <= year; i+=2)
                {
                    result -= 12000;
                }
                for (int i = 1801; i <= year; i+=2)
                {
                    result -= (12000 + (50 * (i - 1800 + 18)));
                }
            if (result >= 0)
            {
                Console.WriteLine("Yes! He will live a carefree life and will have {0:F2} dollars left.", result);
            }
            else if (result < 0)
            {
                Console.WriteLine("He will need {0:F2} dollars to survive.", Math.Abs(result));
            }
            else
            {
            }

        }
    }
}