import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class prog {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        String s = br.readLine();
        int nr = Integer.parseInt(s);
        System.out.println(getFlairNr(nr));



    }

    public static int getFlairNr(int nr) {
        if (nr == 1) {
            return 16;
        }
        if (nr == 2) {
            return 16;
        }

        if (nr == 3) {
            return 15;
        }

        if (nr % 2 == 1) {
            int cat = (nr + 1) / 2;
            return 15 + cat % 2;
        } else {
            int cat = nr / 2;
            return 15 + cat % 2;
        }
    }



}