new_contents: #!/usr/bin/python
  # -*- coding: utf-8 -*-
  
  # Author : Alexandre Pais Gomes
  # Date : 23/05/2015
  
  # Description : If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9.
  # The sum of these multiples is 23. Find the sum of all the multiples of 3 or 5 below 1000.
  
  limit = 1000
  r = 0
  for i in range(limit):
      if((i % 3 == 0) or (i % 5 == 0)):
          r += i
  print(r)
  
subject: Add Python naive version