import java.util.ArrayList;
import java.util.HashSet;
import java.util.Scanner;


public class prog {
	public static int u23(ArrayList<Integer> list) {
		HashSet<Integer> hs = new HashSet<Integer>();
		for (int i = 0; i < list.size(); i++) {
			hs.add(list.get(i) % 23);
		}
		
		return hs.size();
	}
	
	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		ArrayList<Integer> list = new ArrayList<Integer>();
		int n = s.nextInt();
		for (int i = 0; i < n; i++) {
			list.add(s.nextInt());
		}
		
		System.out.println(u23(list));
		
		s.close();		
	}
}