import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		for(int i=1;i<=n;i=i+3){
		System.out.println(i);	
		}
	}

}
/**************************************************************
	Problem: 1713
	User: admin
	Language: Java
	Result: Accepted
	Time:726 ms
	Memory:39872 kb
****************************************************************/