def solution(number: int) -> int:
	"""
	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.

	Finish the solution so that it returns the sum of all
	the multiples of 3 or 5 below the number passed in.
	:param number:
	:return:
	"""

	result = 0
	for n in range(1, number):
		if n % 3 == 0 or n % 5 == 0:
			result += n

	return result