if(ARGV.size<1);print(%(#{$0}\40{line_count}\n));exit(1);end;n=ARGV.shift.to_i;if(n<0);d=[];ARGF.each_line{d+=[it];if-n<d.size;print(d.shift);end;}else;ARGF.each_line.drop(n).each{print(it)}end