Problem 1 - Multiples of 2 and 3

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.

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j = 0
for i in range(1,1000):
 if i%3 == 0 or i%5 == 0:
  j = j + i

print j