Euler Project #1: Multiples of 3 and 5

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.

Answer:
233168

var sum = 0
for i in 1..<1000 {
    if i % 3 == 0 || i % 5 == 0 {
        sum += i
    }
}
print(sum)

 

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