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

static class CaptiveOfNovelty
{
    static void Main()
    {
        var N = Console.ReadLine();
        var ans =  Console.ReadLine()
                            .Split(' ')
                            .GroupBy(x => x)
                            .Where(y => y.Count() == 1)
                            .SelectMany(z => z)
                            .Count();
        Console.WriteLine(ans);
    }
}