#include <bits/stdc++.h>
using namespace std;
using ll = long long;
template <class T> using vec = vector<T>;
template <class T> using vvec = vector<vec<T>>;
template <class T> using vvvec = vector<vvec<T>>;

template<typename Monoid,typename F>
class SegmentTree{
private:
    int sz;
    vector<Monoid> seg;
    const F op;
    const Monoid e;
public:
    SegmentTree(int n,const F op,const Monoid &e):op(op),e(e){
        sz = 1;
        while(sz<=n) sz <<= 1;
        seg.assign(2*sz,e);
    }
    void set(int k, const Monoid &x){
        seg[k+sz] = x;
    }
    void build(){
        for(int i=sz-1;i>0;i--){
            seg[i] = op(seg[2*i],seg[2*i+1]);
        }
    }
    void update(int k,const Monoid &x){
        k += sz;
        seg[k] = x;
        while(k>>=1){
            seg[k] = op(seg[2*k],seg[2*k+1]);
        }
    }
    Monoid query(int l,int r){
        Monoid L = e,R = e;
        for(l+=sz,r+=sz;l<r;l>>=1,r>>=1){
            if(l&1) L = op(L,seg[l++]);
            if(r&1) R = op(seg[--r],R);
        }
        return op(L,R);
    }
};

template<class T>
class Compress {
    int N;
    map<T,int> idx;
    map<int,T> value;
    vec<T> v;
    vec<T> cmp;
public:
    Compress(){}
    void add(T x){v.push_back(x);}
    void build(){
        for(auto &x:v) cmp.push_back(x);
        sort(cmp.begin(),cmp.end());
        cmp.erase(unique(cmp.begin(),cmp.end()),cmp.end());
        N = cmp.size();
        for (int i=0;i<N;i++) idx[cmp[i]] = i;
    }
    int id(T val) {return idx[val];}
    T val(int id) {return cmp[id];}
    int size(){return N;}
};

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N;
    cin >> N;
    vec<int> A(N);
    Compress<int> cmp;
    for(auto& x:A){
        cin >> x;
        cmp.add(x);
    }
    cmp.add(0);
    cmp.build();
    vec<int> L(N+1),R(N+1);
    int M = cmp.size();
    SegmentTree seg(N,[](int a,int b){return max(a,b);},0);
    for(int i=0;i<N;i++){
        int n = seg.query(cmp.id(A[i])+1,M);
        L[i+1] = n+1;
        seg.update(cmp.id(A[i]),n+1);
    }
    for(int i=0;i<M;i++) seg.set(i,0);
    seg.build();
    for(int i=N-1;i>=0;i--){
        int n = seg.query(cmp.id(A[i])+1,M);
        R[i] = n+1;
        seg.update(cmp.id(A[i]),n+1);
    }
    int ans = 0;
    for(int i=0;i<N;i++) ans = max(ans,min(L[i+1]-1,R[i]-1));

    for(int i=0;i<M;i++) seg.set(i,0);
    seg.build();
    for(int i=0;i<N;i++){
        int n = seg.query(0,cmp.id(A[i]));
        L[i+1] = n+1;
        seg.update(cmp.id(A[i]),n+1);
    }
    for(int i=0;i<M;i++) seg.set(i,0);
    seg.build();
    for(int i=N-1;i>=0;i--){
        int n = seg.query(0,cmp.id(A[i]));
        R[i] = n+1;
        seg.update(cmp.id(A[i]),n+1);
    }
    for(int i=0;i<N;i++) ans = max(ans,min(L[i+1]-1,R[i]-1));
    cout << ans << "\n";
}