import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        HashMap<Integer, Integer> map = new HashMap<>();
        for (int i = 0; i < n; i++) {
            int x = sc.nextInt();
            if (map.containsKey(x)) {
                map.put(x, map.get(x) + 1);
            } else {
                map.put(x, 1);
            }
        }
        int count = 0;
        for (int x : map.values()) {
            if (x == 1) {
                count++;
            }
        }
        System.out.println(count);
    }
}