import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		Integer N = sc.nextInt();
		Integer[] diameter = new Integer[N];
		for (int i = 0; i < diameter.length; i++) {
			diameter[i] = sc.nextInt();
		}
		Arrays.sort(diameter, Comparator.reverseOrder());
		int ans = 0;
		for (int i = 0; i < diameter.length; i++) {
			if (i != 0 && diameter[i - 1] == diameter[i])
				continue;
			ans++;
		}
		System.out.println(ans);
		sc.close();
	}
}
/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