03. Numbers 1...N with Step 3

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);

        int n = Integer.parseInt(scanner.nextLine());

        for (int i = 1; i <=n ; i+=3) {
            System.out.println(i);
        }


    }

}