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

public class Main {

	public static void main(String[] args) {
		int N;
		Scanner input = new Scanner(System.in);
		N = input.nextInt();
		ArrayList<Integer> arr = new ArrayList<Integer>();
		
		for (int i = 0; i < N; i++) {
			int temp = input.nextInt();
			if(!arr.contains(temp)) {
				arr.add(temp);
			}
		}
		System.out.println(arr.size());
	}
}
/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