old_contents: sum = 0
  for number in range(1000):
      if not (number % 3 or number % 5):
          sum = sum + number
  print(sum)
  
new_contents: sum = 0
  for number in range(1000):
      if not (number % 3 and number % 5):
          sum = sum + number
  print(sum)
  
subject: Fix logic bug in 1.py from initial commit