public class ThreesAndFives {

    private static final int LIMIT = 10_000_000;   // = 10^7

    public static void main(String[] args) {
        int threes = 3;
        int fives = 5;
        while (threes <= LIMIT || fives < LIMIT) {
            final int smaller = Math.min(threes, fives);
            System.out.println(smaller);
            if (threes == smaller) {
                threes += 3;
            }
            if (fives == smaller) {
                fives += 5;
            }
        }
    }

}