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.
total_sum = 0
for i in range(1000):
if (i%3 == 0 or i%5 == 0):
total_sum = total_sum+i
print total_sum