package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func main() {
	N := nextInt()

	m := make(map[int]int, N)
	for i := 0; i < N; i++ {
		A := nextInt()
		m[A]++
	}

	ans := 0
	for _, v := range m {
		if v == 1 {
			ans++
		}
	}
	fmt.Println(ans)
}

var sc = bufio.NewScanner(os.Stdin)

func next() string {
	sc.Split(bufio.ScanWords)
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	i, e := strconv.Atoi(next())
	if e != nil {
		panic(e)
	}
	return i
}