¡Feliz Navidad!

require "base64"  
    
 text='ZmVsaXogbmF2aWRhZCBoYXgwcnMh'  
   
 class ChristmasTree  
  FIRST_LINE_LENGTH = 1  
  LEVEL_HEIGHT   = 3  
   
  def initialize(levels)  
   @levels       = levels.to_i < 1 ? 3 : levels.to_i  
   @last_line_length  = 5 + ((@levels - 1) * 2)  
   @current_line_length = FIRST_LINE_LENGTH  
  end  
   
  def draw_level  
   (1..LEVEL_HEIGHT).each do |line|  
    puts ("*" * @current_line_length).center(@last_line_length)  
    @current_line_length += 2 unless line == 3  
   end  
   @current_line_length = @current_line_length - 2  
  end  
   
  def draw_trunk  
   trunk_width = trunk_height = ((@last_line_length / 2) - 2).round  
   (1..trunk_height).each { puts ("|" * trunk_width).center(@last_line_length) }  
  end  
   
  def draw  
   (1..@levels).each { draw_level }  
   draw_trunk  
  end  
 end  
   
 ChristmasTree.new(ARGV.first).draw  
 puts Base64.decode64(text)  

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