#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    int N; cin >> N;
    vector<int> A(N);
    rep(i,N) cin >> A[i];

    auto f = [N](vector<int> A) {
        auto LIS = [N](vector<int> A) {
            int INF = numeric_limits<int>::max();
            vector<int> dp1(N, INF), dp2(N, 0);
            rep(i,N) {
                auto it = lower_bound(dp1.begin(), dp1.end(), A[i]);
                *it = A[i];
                dp2[i] = lower_bound(dp1.begin(), dp1.end(), INF) - dp1.begin();
            }
            return dp2;
        };

        vector<int> L = LIS(A);
        reverse(A.begin(), A.end());
        vector<int> R = LIS(A);
        reverse(A.begin(), A.end());
        int ans = 0;
        rep(i,N) ans = max(ans, min(L[i], R[i]) - 1);
        return ans;
    };

    int ans = 0;
    rep(_,2) {
        ans = max(ans, f(A));
        rep(i,N) A[i] *= -1;
    }
    cout << ans << endl;
}