#include <iostream>
#include <vector>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)

constexpr int INF = 2e9;

int main() {
    int n;
    cin >> n;
    vector<int> a(n);
    rep(i, n) cin >> a[i];
    vector<int> dp(n, INF);
    vector<int> front_up(n), back_up(n);
    vector<int> front_down(n), back_down(n);
    rep(i, n) {
        *lower_bound(dp.begin(), dp.end(), a[i]) = a[i];
        front_up[i] = lower_bound(dp.begin(), dp.end(), INF) - dp.begin();
    }
    rep(i, n) dp[i] = INF;
    for (int i = n - 1; i >= 0; i--) {
        *lower_bound(dp.begin(), dp.end(), a[i]) = a[i];
        back_up[i] = lower_bound(dp.begin(), dp.end(), INF) - dp.begin();
    }
    rep(i, n) dp[i] = INF;
    rep(i, n) a[i] *= -1;
    rep(i, n) {
        *lower_bound(dp.begin(), dp.end(), a[i]) = a[i];
        front_down[i] = lower_bound(dp.begin(), dp.end(), INF) - dp.begin();
    }
    rep(i, n) dp[i] = INF;
    for (int i = n - 1; i >= 0; i--) {
        *lower_bound(dp.begin(), dp.end(), a[i]) = a[i];
        back_down[i] = lower_bound(dp.begin(), dp.end(), INF) - dp.begin();
    }
    int ans = 0;
    rep(i, n) {
        ans = max(ans, min(front_up[i] - 1, back_up[i]));
        ans = max(ans, min(front_down[i] - 1, back_down[i]));
    }
    cout << ans << endl;
    return 0;
}