#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000

int get(vector<int> a){
	int n = a.size();
	vector dp(n,vector(n,vector<int>(2,-Inf)));
	rep(i,n){
		dp[i][i][0] = 1;
		dp[i][i][1] = 1;
	}
	
	for(int i=2;i<=n;i++){
		rep(j,n){
			int l = j;
			int r = j+i-1;
			if(r>=n)break;
			
			dp[l][r][0] = max(dp[l][r][0],dp[l][r-1][0]);
			if(a[r]>a[l])dp[l][r][0] = max(dp[l][r][0],dp[l+1][r][1]+1);
			dp[l][r][1] = max(dp[l][r][1],dp[l+1][r][1]);
			if(a[l]>a[r])dp[l][r][1] = max(dp[l][r][1],dp[l][r-1][0]+1);
			
			
			
		}
	}
	return max(dp[0][n-1][0],dp[0][n-1][1]);
	
}

int main(){
	
	int n;
	cin>>n;
	
	vector<int> a(n);
	rep(i,n)cin>>a[i];
	
	int ans = get(a);
	rep(i,n)a[i] *= -1;
//	ans = max(ans,get(a));
	
	cout<<ans<<endl;
	
	return 0;
}