#!/usr/bin/env python3
  # -*- coding: utf-8 -*-
  
  import sys
  
  if len(sys.argv) == 1 or not sys.argv[1].isnumeric() or int(sys.argv[1]) <= 0:
  	msg = """\
  Usage: {:s} nbr_int
      nbr_int: Un nombre entier supérieur à 0""".format(sys.argv[0])
  	print(msg)
  	sys.exit(1)
  
  a,b = 0,1
  
  while b < int(sys.argv[1]):
  	print(b)
  	a,b = b,a+b
  
  print("b/a = {:1.15f}".format(b/a))
  
  sys.exit(0)