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

namespace yuki
{
    class Program
    {
        static void Main(string[] args)
        {
            int N = int.Parse(Console.ReadLine());
            string str = Console.ReadLine();
            string[] A = str.Split();
            int cnt = 0;

            for (int i = 0; i < N; i++)
            {
                if (A[i].Length == str.Length - str.Replace(A[i], "").Length)
                {
                    cnt++;
                }
            }
            Console.WriteLine(cnt);
        }
    }
}