def sum_multiples_three_five(number):
  """
  number: random integer
  return: the sum of all multipliers of 3 and 5 below number
  """
  multipliers = []
  n = 0
  while n < number:
      if n % 3 == 0 or n % 5 == 0:
          multipliers.append(n)
      n += 1
  return sum(multipliers)