import java.util.*;
public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        // 整数の入力
        int n = sc.nextInt();
        Integer val;
        List<Integer> list = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            val = sc.nextInt();
            if (!list.contains(val)) {
                list.add(val);
            }
        }
        // 出力
        System.out.println(list.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