#!/usr/bin/ruby -w

if ARGV.size < 1
   print "#{$0} {line_count}\n"
   exit 1
end

count = ARGV.shift.to_i
if count < 0
   buffer = []
   ARGF.each_line{
      buffer += [it]
      if -count < buffer.size
         print buffer.shift
      end
   }
else
   ARGF.each_line.drop(count).each{print it}
end