#include <iostream>
#include <algorithm>
#include <vector>
#include <functional>
#include <map>

template <class T>
std::map<T, int> compress(std::vector<T>& v) {
    std::sort(v.begin(), v.end());
    v.erase(std::unique(v.begin(), v.end()), v.end());

    std::map<T, int> rev;
    for (int i = 0; i < (int)v.size(); ++i) rev[v[i]] = i;
    return rev;
}

template <class T>
struct SegmentTree {
    using Merger = std::function<T(T, T)>;

    int length;
    std::vector<T> dat;
    T unit;
    Merger merge;

    SegmentTree() = default;

    SegmentTree(int n, const T& unit, const Merger& merge)
        : length(1), unit(unit), merge(merge) {
        while (length < n) length <<= 1;
        dat.assign(length * 2, unit);
    }

    template <class Container>
    SegmentTree(const Container& elems, const T& unit, const Merger& merge)
        : length(1), unit(unit), merge(merge) {
        int n = elems.size();
        while (length < n) length <<= 1;

        dat.assign(length * 2, unit);

        std::copy(elems.begin(), elems.end(), dat.begin() + length);

        for (int nidx = length - 1; nidx >= 1; --nidx) {
            T vl = dat[nidx * 2 + 0];
            T vr = dat[nidx * 2 + 1];
            dat[nidx] = merge(vl, vr);
        }
    }

    void update(int nidx, const T& elem) {
        nidx += length;
        dat[nidx] = elem;

        while (nidx > 0) {
            nidx >>= 1;
            T vl = dat[nidx * 2 + 0];
            T vr = dat[nidx * 2 + 1];
            dat[nidx] = merge(vl, vr);
        }
    }

    T fold(int ql, int qr) const {
        ql = std::max(ql, 0);
        qr = std::min(qr, length);
        ql += length, qr += length;

        T lacc = unit, racc = unit;
        while (ql < qr) {
            if (ql & 1) {
                lacc = merge(lacc, dat[ql]);
                ++ql;
            }
            if (qr & 1) {
                --qr;
                racc = merge(dat[qr], racc);
            }
            ql >>= 1, qr >>= 1;
        }

        return merge(lacc, racc);
    }

    T get(int idx) const { return dat[idx + length]; }
    T fold_all() const { return dat[1]; }
};

void solve() {
    int n;
    std::cin >> n;

    std::vector<int> xs(n);
    for (auto& x : xs) std::cin >> x;

    int m;
    {
        auto nxs = xs;
        auto xrev = compress(nxs);
        m = nxs.size();
        for (auto& x : xs) x = xrev[x];
    }

    int ans = 0;

    SegmentTree<int>
        seg(m, 0, [](auto a, auto b) { return std::max(a, b); });

    for (int q = 0; q < 2; ++q) {
        for (int i = 0; i < m; ++i) seg.update(i, 0);

        std::vector<int> fore(n), back(n);
        for (int i = 0; i < n; ++i) {
            fore[i] = seg.fold(xs[i] + 1, m) + 1;
            seg.update(xs[i], fore[i]);
        }

        for (int i = 0; i < m; ++i) seg.update(i, 0);

        for (int i = n - 1; i >= 0; --i) {
            back[i] = seg.fold(xs[i] + 1, m) + 1;
            seg.update(xs[i], back[i]);
        }

        for (int i = 0; i < n; ++i) {
            ans = std::max(ans, std::min(fore[i], back[i]) - 1);
        }

        for (auto& x : xs) x = m - 1 - x;
    }

    std::cout << ans << "\n";
}

int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}