public class No_182 {

	public static void main(String[] args) {
		java.util.LinkedList<Integer> list = new java.util.LinkedList<Integer>();
		java.util.Scanner sc = new java.util.Scanner(System.in);
		int n = sc.nextInt();
		int count = 0;

		for (int i = 0; i < n; i++) {
			list.add(sc.nextInt());
		}

		while (!list.isEmpty()) {
			Integer x = list.poll();
			if (!list.contains(x)) {
				count++;
			} else {
				while (list.remove(x)) {}
			}
		}
		System.out.println(count);
		sc.close();

	}

}