byte sized c++

Project Euler

21.1 - Multiples of 3 and 5

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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.

Find the sum of all the multiples of 3 or 5 below 1000.

This problem is taken from https://projecteuler.net/problem=1