Back To The Past

using System;
class Example
{
    public static void Main()
    {
        decimal Money = decimal.Parse(Console.ReadLine());
        int year = int.Parse(Console.ReadLine());
        int age = 18;
        int difference = year - 1800;

        for (int i = difference; i >= 0; i--)
        {
            if (i % 2 == 0)
            {
                Money = Money - 12000;
            }
            else
            {
                Money = Money - (12000 + (50 * age));
            }
            age++;
        }

        if (Money >= 0)
        {
            Console.WriteLine("Yes! He will live a carefree life and will have {0:F2} dollars left.", Math.Abs(Money));
        }
        else
        {
            Console.WriteLine("He will need {0:F2} dollars to survive.", Math.Abs(Money));
        }
    }
}