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257 B

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// https://projecteuler.net/problem=1
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fn main() {
let mut sum = 0;
for n in 1..= 999 {
if n % 3 == 0 {
sum += n;
}
if n % 5 == 0 && n % 3 != 0 {
sum += n;
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}
}
println!("{}", sum);
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}