package main

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

func nextInt(sc *bufio.Scanner) int {
	sc.Scan()
	i, err := strconv.Atoi(sc.Text())
	if err != nil {
		log.Fatal(err)
	}
	return i
}

func nextIntList(sc *bufio.Scanner) []int {
	sc.Scan()
	input := strings.Split(sc.Text(), " ")
	result := make([]int, len(input))
	for i, v := range input {
		if j, err := strconv.Atoi(v); err != nil {
			log.Fatal(err)
		} else {
			result[i] = j
		}
	}
	return result
}

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	n := nextInt(sc)
	counter := map[int]int{}
	result := 0

	for i := 0; i < n; i++ {
		counter[nextInt(sc)] += 1
	}
	for _, v := range counter {
		if v == 1 {
			result += 1
		}
	}
	fmt.Println(result)
}