import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int n = scan.nextInt();
if(n % 2 == 0) {
System.out.print(2 + " ");
}
if(n % 3 == 0) {
System.out.print(3 + " ");
}
if(n % 7 == 0) {
System.out.println(7);
}
if(n % 2 != 0 && n % 3 != 0 && n % 7 != 0) {
System.out.println("n");
}
}
}