import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner stdin = new Scanner(System.in);

        int N = stdin.nextInt();

        Integer a[] = new Integer[N];

        for (int i = 0; i < N; i++) {
            a[i] = stdin.nextInt();
        }

        Arrays.sort(a, Comparator.reverseOrder());

        int count = 1;

        for (int i = 0; i < N - 1; i++) {
            if (a[i] != a[i + 1]) {
                count++;
            }
        }

        System.out.println(count);
    }
}

/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