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

namespace yukicoderTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            string findlist = Console.ReadLine();
            findlist = findlist.Replace(" ","");
            int strcnt = int.Parse(input);
            int cnt = findlist.Length;
            for(int i=0;i<findlist.Length-1;i++)
            {
                strcnt = findlist.Length - findlist.Replace(i.ToString(), "").Length;
                if(strcnt!=1)
                {
                    cnt = cnt - strcnt;
                }
            }
            
            Console.WriteLine(cnt);
        }

    }
}