import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		if (n == 2 || n == 4 || n == 5 || n == 7 || n == 9) {
			System.out.println("pon");
		} else if (n == 0 || n == 1 || n == 6 || n == 8) {
			System.out.println("pon");
		} else {
			System.out.println("bon");
		}

	}

}