import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		List<Integer> d = new ArrayList<>();
		int answer = 1;

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

		Collections.sort(d);

		for (int i = 0; i < N - 1; i++) {
			if (d.get(i) < d.get(i + 1)) answer++;
		}

		System.out.println(answer);
	}
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz