old_contents: # Project Euler - Problem 1
  sum = 0
  for i in xrange(1, 1001):
      if i % 3 == 0 or i % 5 == 0:
          sum = sum + i
  
  print "The sum is: {}".format(sum)
  
new_contents: # Project Euler - Problem 1
  # 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.
  
  def main(limit):
      sum = 0
      for i in xrange(1, limit):
          if i % 3 == 0 or i % 5 == 0:
              sum = sum + i
  
      print "The sum of all multiples of 3 and 5 below {} is: {}".format(limit, sum)
  
  if __name__ == "__main__":
      main(10)
      main(1001)
  
subject: Clean up problem 1 solution a bit.