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

constexpr ll INF = 2e9;

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