using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication5
{
    class Program
    {
        static void Main(string[] args)
        {
            Dictionary<string, int> seisu = new Dictionary<string, int>();

            string row = Console.ReadLine();
            int N = int.Parse(row);

            row = Console.ReadLine();
            // 空白区切りで一旦文字列の配列に区切る
            string[] A = row.Split();

            for (int j = 0; j < N; j++)
            {
                string num = A[j];
                if (seisu.ContainsKey(num))
                {
                    seisu[num] += 1;
                }
                else
                {
                    seisu[num] = 1;
                }
            }
            int count = 0;
            foreach(string key in seisu.Keys)
            {
                if(seisu[key] == 1)
                {
                    count++;
                }
            }

            Console.WriteLine(count);
        }
    }
}