Back to the past

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

namespace ConsoleApplication83
{
    class Program
    {
        static void Main(string[] args)
        {
            var x = double.Parse(Console.ReadLine());
            var godina = int.Parse(Console.ReadLine());
            int age = 18;
            for (int i = 1800; i<= godina; i++)
            {
                if (i % 2 == 0)
                {
                    x-=12000;
                }
                else
                {
                    x=x - (12000 + age * 50);
                }
                age++;
            }
           if (x>=0)
            {
                Console.WriteLine("Yes! He will live a carefree life and will have {0:0.00} dollars left.", x);
            }
           else if (x<0)
            {
                Console.WriteLine("He will need {0:0.00} dollars to survive.", Math.Abs(x));
            }
        }
    }
}