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

public class Main
{
    private final static Main main = new Main();

    public static void main(String[] args)
    {
        long l = System.currentTimeMillis();
        main.solve();
        //System.out.println("処理時間：" + (System.currentTimeMillis() - l));
    }

    private void solve()
    {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        Map<Integer, Integer> map = new HashMap<Integer, Integer>();
        for(int i=0; i<n; ++i)
        {
            int in = sc.nextInt();
            if(map.containsKey(in))
            {
                map.put(in, map.get(in)+1);
            }
            else
            {
                map.put(in, 1);
            }
        }
        int ans = 0;
        for(Map.Entry<Integer, Integer> e : map.entrySet())
        {
            if(e.getValue() == 1)
            {
                ++ans;
            }
        }
        System.out.println(ans);
    }
}