import java.util.*;
public class Main {
	static int ans;
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		List<Integer> list = new ArrayList<Integer>();
		for(int i = 0;i < n;i++) {
			boolean has = false;
			int d = sc.nextInt();
			for(int k:list) {
				if(d == k) {
					has = true;
					break;
				}
			}
			if(!has) {
				ans++;
				list.add(d);
			}
		}
		System.out.println(ans);
	}
}
/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