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Problem 1: Multiples of 3 or 5

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.

Solution:

x=0
sum=0

while (x < 1000):
	if x % 3 == 0 or x % 5 == 0:
		sum += x
	x += 1

print(sum)