#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> dp(N, INF), rank(N);
            rep(i,N) {
                int p = lower_bound(dp.begin(), dp.end(), A[i]) - dp.begin();
                dp[p] = A[i];
                rank[i] = p + 1;
            }
            return rank;
        };

        vector<int> L = LIS(A);
        reverse(A.begin(), A.end());
        vector<int> R = LIS(A);
        reverse(A.begin(), A.end());
        reverse(R.begin(), R.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;
}