#include<bits/stdc++.h>

using namespace std;
using ll = long long;
const int INF = 1e9;
int n;


vector<int> LIS(vector<int> a) {
	vector<int> dp(n, INF);
	vector<int> f(n);
	for(int i = 0; i < n; i++) {
		auto itr = lower_bound(dp.begin(), dp.end(), a[i]);
		f[i] = itr - dp.begin();
		*itr = a[i];
	}
	return f;

}

int f(vector<int> a, int cof) {
	for(auto &i: a) i *= cof;
	vector<int> frot = LIS(a);
	reverse(a.begin(), a.end());
	vector<int> back = LIS(a);
	reverse(back.begin(), back.end());

	int nax = 0;
	for(int i = 1; i < n - 1; i++) {
		nax = max(nax, min(frot[i], back[i]));
	}

	return nax;

}

int main()
{
	cin >> n;
	vector<int> a(n);
	for(int i = 0; i < n; i++)cin >> a[i];
	cout << max(f(a, 1), f(a,-1)) << endl;
}