gistfile1.rbx

class Integer
  def even?
    self % 2 == 0
  end
end

highest, num = 0, 0

(1..1_000_000).each { |i|
  original, count = i, 0
  until i == 1
    if i.even?
      i = i / 2
    else
      i = 3 * i + 1
    end
    count += 1
  end
  
  if count > highest
    num = original
    highest = count
  end
}

puts "#{num}"