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

namespace ForYukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int N = int.Parse(Console.ReadLine());
            int[] S = Console.ReadLine().Split().Select(int.Parse).ToArray();
            bool isOne;
            var cnt = 0;

            for (int i = 0; i < N; i++)
            {
                isOne = true;

                for (int j = 0; j < N; j++)
                {
                    if (i == j)
                    {
                        continue;
                    }
                    else if (S[i] == S[j])
                    {
                        isOne = false;
                        break;
                    }
                }
                if (isOne) cnt++;
            }

            Console.WriteLine(cnt);
        }
    }
}