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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.

Write a function to find the sum of all the multiples of 3 or 5 below n (where is a positive integer).

def compute(n):
	ans = sum(x for x in range(n) if (x % 3 == 0 or x % 5 == 0))
	return ans