using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        var N = int.Parse(Console.ReadLine());
        var arr = Console.ReadLine().Split(' ')
                                      .Select(x => int.Parse(x))
                                      .ToArray();
        var map = new Dictionary<int, int>();
        for (int i = 0; i < N; i++)
        {
            if  (map.ContainsKey(arr[i])) map[arr[i]]++;
            else map.Add(arr[i], 1);
        }

        int novelty = 0;
        foreach (var data in map)
        {
            if (data.Value == 1) novelty++;
        }
        Console.WriteLine(novelty);
    }
}