package no182;

import java.util.Arrays;
import java.util.Scanner;
import java.util.stream.Collectors;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] a = new int[n];
		for(int i=0;i<n;i++) {
			a[i] = sc.nextInt();
		}
		System.out.println(Arrays.stream(a).boxed().collect(Collectors.groupingBy(x -> x, Collectors.counting())).values().stream().filter(x -> x == 1).collect(Collectors.counting()).longValue());
	}
}