import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;

public class Main {
    public static void main(String args[]) throws Exception {
        Scanner s = new Scanner(System.in);
        int n = s.nextInt();
        int a[] = new int[n];
        for (int i = 0; i < n; i++) {
            a[i] = s.nextInt();
        }
        Arrays.sort(a);
        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