#!/usr/bin/env ruby

require 'optimist'

def main
  conf = Optimist::options do
    opt :only_low, "inverse only for values < 1.0", :type => :bool, :default => false, :short => "-l"
    opt :only_high, "inverse only for values > 1.0", :type => :bool, :default => false, :short => "-h"
  end

  while line = STDIN.gets
    f = line.to_f

    if conf[:only_low]
      if f < 1
        puts line.to_f**(-1)
      else
        puts line.to_f
      end
    elsif conf[:only_high]
      if f > 1
        puts line.to_f**(-1)
      else
        puts line.to_f
      end
    else
        puts line.to_f**(-1)
    end
  end
end

main