projecteuler.net/001/solution.rs

// https://projecteuler.net/problem=1 

fn main() {
        let mut sum = 0;
        for n in 1..= 999 {
                if n % 3 == 0 {
                        sum += n;
                        // println!("-- # {}", n);
                }

                if n % 5 == 0 && n % 3 != 0 {
                        // println!("++ # {}", n);
                        sum += n;
                }
        }
        println!("{}", sum);
}