package main

import (
	"bufio"
	"os"
	"strconv"
	"math/rand"
	"fmt"
	"strings"
)

var s = bufio.NewScanner(os.Stdin)

func next() string {

	s.Split(bufio.ScanWords)
	s.Scan()
	return s.Text()
}
func nextLine() string {
	s.Split(bufio.ScanLines)
	s.Scan()
	if nil != s.Err() {
		panic(s.Err())
	}
	return s.Text()
}

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


func randInt(a int , b int) int {
	return rand.Intn(b - a + 1) + a
}

func mapToString(arr []int) []string {
	ret := make([]string, len(arr))
	for i := 0; i < len(arr); i++ {
		ret[i] = strconv.Itoa(arr[i])
	}
	return ret
}


func PrintI(args ...int) {
	fmt.Println(strings.Join(mapToString(args), " "))
}



func main() {
	N := nextInt()
	A := make([]int, N)
	var set = map[int]int{}

	for i := 0; i < N; i++ {
		A[i] = nextInt()
		set[A[i]] +=1
	}
	var ans = 0
	for _, v := range set {
		if v == 1 {
			ans++
		}
	}
	PrintI(ans)
}