Problem 1. Multiples of 3 and 5

Problem 1.  Multiples of 3 and 5 題目鏈接：https://projecteuler.net/problem=1 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 2

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