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

class yc2
{
    static void Main()
    {
        int N = int.Parse(Console.ReadLine());
        string[] str = Console.ReadLine().Split();
        List<string> lst = new List<string>();
        
        for (int i = 0; i < str.Length; i++)
        {
            lst.Add(str[i]);
        }

        int cout = 0, lstcout;

        while(lst.Count != 0)
        {
            lstcout = lst.Count;
            lst.RemoveAll(t => t == lst[0]);
            if (lstcout - lst.Count == 1) cout++;
        }
        Console.WriteLine(cout);
    }
}