import java.io.*;
import java.util.*;
import java.math.*;

class Main182 {
	
	public static void out (Object out) {
		System.out.println(out);
	}
	
	public static void main (String[] args) throws IOException {
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		int ans = 0;
		int n = Integer.parseInt(br.readLine());
		String[] line = br.readLine().split(" ");
		HashMap<String, Integer> map = new HashMap<String, Integer>();
		
		for (int i = 0; i < n; i++) {
			if (map.containsKey(line[i])) {
				map.put(line[i], map.get(line[i]) + 1);
			} else {
				map.put(line[i], 1);
			}
		}
		for (String key : map.keySet()) {
			if (map.get(key) == 1) ans++;
		}
		
		out(ans);
		
	}
}