fb careers challenge puzzle: hoppity

hoppity.rb

#!/usr/bin/ruby

# get file name arg from command line
File.open(ARGV[0], 'r') do | f |
  # read the first line containing the integer
  (1..f.readline.strip.to_i).each do | i |
    # div by 3?
    if ( i % 3 ) == 0 then
      # and by 5?
      if ( i % 5 ) == 0 then
        puts 'Hop'
      else
        puts 'Hoppity'
      end
    # or by 5?
    elsif ( i % 5 ) == 0 then
      puts 'Hophop'
    end
  end
end