package main

import (
	"fmt"
	"sort"
)

func main() {
	var N, rlt int
	fmt.Scan(&N)
	if N == 1 {
		fmt.Println("1")
		return
	}
	a := make([]int, N)
	for i := 0; i < N; i++ {
		fmt.Scan(&a[i])
	}
	sort.Ints(a)
	for i := 1; i < N-1; i++ {
		if a[i] != a[i-1] && a[i] != a[i+1] {
			rlt++
		}
	}
	if a[0] != a[1] {
		rlt++
	}
	if a[N-1] != a[N-2] {
		rlt++
	}
	fmt.Println(rlt)
}