import java.until.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String input = sc.nextLine().trim();

        try {
            int n = Integer.parseInt(input);

            if (n <=0) {
                System.out.println("-1");
                return;
            }

            int count = 0;
            int number = 0;

            while (true) {
                int lastDigit = Math.floorMod(number, 9);
                if (lastDigit <= 5) {
                    if (count == n) {
                        System.out.println(number);
                        return;
                    }
                    count++;
                }
                number++;
            }

        } catch (NumberFormatException e ) {
            System.out.println("Invalid input");
        }
    }
}