import java.util.HashMap;
import java.util.Scanner;

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<Integer, Integer>();

        for (int i = 0; i < n; i++) {

            int a = sc.nextInt();

            if (map.containsKey(a)) {
                map.put(a, (map.get(a) + 1));
            } else {
                map.put(a, 1);
            }

        }

        int count = 0;

        for (int key : map.keySet()) {

            if (map.get(key) == 1) {
                count++;
            }

        }

        System.out.println(count);

    }

}