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.

http://projecteuler.net/problem=1

- try solving it as a python one-liner
- try optimizing your solution for speed

highlight below for my solution:

sum(range(0,1000,3)) + sum(range(0,1000,5)) - sum(range(0,1000,15))

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