package main

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

func configure(scanner *bufio.Scanner) {
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
}
func getNextString(scanner *bufio.Scanner) string {
	scanned := scanner.Scan()
	if !scanned {
		panic("scan failed")
	}
	return scanner.Text()
}
func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}
func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}
func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}
func main() {
	fp := os.Stdin
	wfp := os.Stdout
	extra := 0
	if os.Getenv("I") == "IronMan" {
		fp, _ = os.Open(os.Getenv("END_GAME"))
		extra = 100
	}
	scanner := bufio.NewScanner(fp)
	configure(scanner)
	writer := bufio.NewWriter(wfp)
	defer func() {
		r := recover()
		if r != nil {
			fmt.Fprintln(writer, r)
		}
		writer.Flush()
	}()
	solve(scanner, writer)
	for i := 0; i < extra; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
}
func solve(scanner *bufio.Scanner, writer *bufio.Writer) {
	n := getNextInt(scanner)
	aa := make([]int, n)
	for i := 0; i < n; i++ {
		aa[i] = getNextInt(scanner)
	}
	ll := make([]int, n)
	rr := make([]int, n)
	lll := make([]int, n)
	rrr := make([]int, n)
	yokubalis := make([]int, n)
	yokubalisugi := make([]int, n)
	yokubalisugiya := make([]int, n)
	yokubalisugiyaro := make([]int, n)
	for i := 0; i < n; i++ {
		yokubalis[i] = math.MaxInt32
		yokubalisugi[i] = math.MaxInt32
		// yokubalisugiya[i] = math.MaxInt32
		// yokubalisugiyaro[i] = math.MaxInt32
	}
	for i := 0; i < n; i++ {
		r := lower(n, aa[i], yokubalis, func(a, b int) bool {
			return a < b
		})
		ll[i] = r
	}
	for i := 0; i < n; i++ {
		r := lower(n, aa[i], yokubalisugiya, func(a, b int) bool {
			return a > b
		})
		lll[i] = r
	}
	for i := n - 1; i >= 0; i-- {
		r := lower(n, aa[i], yokubalisugi, func(a, b int) bool {
			return a < b
		})
		rr[i] = r
	}
	for i := n - 1; i >= 0; i-- {
		r := lower(n, aa[i], yokubalisugiyaro, func(a, b int) bool {
			return a > b
		})
		rrr[i] = r
	}
	var ans int
	for i := 0; i < n; i++ {
		ans = max(ans, min(ll[i], rr[i]))
		ans = max(ans, min(lll[i], rrr[i]))
	}
	fmt.Fprintln(writer, ans)
}
func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}
func max(a, b int) int {
	return -min(-a, -b)
}
func lower(n, a int, yokubalis []int, less func(int, int) bool) int {
	l := -1
	r := n
	for l+1 < r {
		m := (l + r) >> 1
		if less(a, yokubalis[m]) {
			r = m
			continue
		}
		l = m
	}
	yokubalis[r] = a
	return r
}