ProgBasicsJavaBook7.1ComplexLoop01Numbers1...NwithStep3

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);
        }


    }
}