01._Back_To_The_Past

using System;

namespace _01._Back_To_The_Past
{
    class BackToThePast
    {
        static void Main(string[] args)
        {
            double inheritence = double.Parse(Console.ReadLine());
            int life = int.Parse(Console.ReadLine());

            int age = 18;
            int yearStart = 1800;
            int yearsToLive = life - yearStart;


            for (int i = 0; i <= yearsToLive; i++)
            {
                if (yearStart % 2 == 0)
                {
                    inheritence = inheritence - 12000;
                    yearStart = yearStart + 1;
                    age = age + 1;
                }
                else if (yearStart % 2 != 0)
                {
                    inheritence = inheritence - (12000 + 50 * age);
                    yearStart = yearStart + 1;
                    age = age + 1;
                }
            }

            if (inheritence >= 0)
            {
                Console.WriteLine("Yes! He will live a carefree life and will have " + $"{inheritence:f2}" + " dollars left.");
            }
            else
            {
                inheritence = Math.Abs(inheritence);
                Console.WriteLine("He will need " + $"{inheritence:f2}" + " dollars to survive.");
            }
        }
    }
}