算法提高 简单加法

public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int sum = 0 ;
        for ( int i= 3 ; i < 1000 ; i++){
            if ( i % 3 == 0 || i % 5 == 0){
                sum += i;
            }
        }
        System.out.println(sum);
    }

}