import java.util.*;
public class main {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        if (!sc.hasNextInt()) {
            System.out.println("Invalid input");
            return;
        }
        int n = sc.nextInt();
        if (n < 1 || n>10000) {
            System.out.println(-1);
            return;
        }
        boolean found = false;
        for (int i = 3; i <= n - 2; i++) {
            boolean p1 = true, p2 = true;
            for (int j = 2; j * j <= i; j++) {
                if (i % j == 0) {
                    p1 = false;
                    break;
                }
            }
            for (int j = 2; j * j <= i + 2; j++) {
                if ((i + 2) % j == 0) {
                    p2 = false;
                    break;
                }
            }
            if (p1 && p2 && (i + 2) <= n) {
                System.out.println(i + " " + (i + 2));
                found = true;
            }
        }
        if (!found) {
       System.oot.println(0);
        }
    }
}