#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = 1; i <= (n); ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
using namespace std;
typedef pair<int,int> P;
typedef long long int ll;
#define dame { puts("-1"); return 0;}
#define yn {puts("Yes");}else{puts("No");}

const int MAX_N = 1001001;
const int INF = 1001001001;
int n;
int a[MAX_N];
int dp[MAX_N];
int l[MAX_N], r[MAX_N];

int main() {
    cin >> n;
    rep(i,n){
        cin >> a[i];
    }

    fill(dp, dp+n, 0);
    drep(i,n){
        auto ite = lower_bound(dp, dp+n, a[i]+1);
        r[i] = n - (ite - dp);
        ite--;
        *ite = a[i];
    }
    rep(i,n)dp[i] = 0;
    rep(i,n){
        auto ite = lower_bound(dp, dp+n, a[i]+1);
        l[i] = n - (ite - dp);
        ite--;
        *ite = a[i];
    }
    int ans = 0;
    rep(i,n){
        ans = max(ans,min(l[i],r[i]));
    }
    rep(i,n)a[i] = INF - a[i];
    fill(dp, dp+n, 0);
    drep(i,n){
        auto ite = lower_bound(dp, dp+n, a[i]+1);
        r[i] = n - (ite - dp);
        ite--;
        *ite = a[i];
    }
    rep(i,n)dp[i] = 0;
    rep(i,n){
        auto ite = lower_bound(dp, dp+n, a[i]+1);
        l[i] = n - (ite - dp);
        ite--;
        *ite = a[i];
    }
    rep(i,n){
        ans = max(ans,min(l[i],r[i]));
    }
    cout << ans << endl;
    return 0;
}