#include<bits/stdc++.h>
using namespace std;
#define int ll
#define ll long long

#define I32_MAX 2147483647
#define I64_MAX 9223372036854775807LL
#define I64_MAX2 1223372036854775807LL
#define INF I64_MAX2
// #define MOD 1000000007
#define MOD 998244353 
#define MEM_SIZE 101010
#define DEBUG_OUT true

#define ALL(x) (x).begin(), (x).end()


template<typename T> void DEBUG(T e){if(DEBUG_OUT == false)return; std::cout << e <<" ";}
template<typename T> void DEBUG(const std::vector<T>& v){if(DEBUG_OUT == false)return;for(const auto& e : v){std::cout<< e << " "; } std::cout << std::endl;}
template<typename T> void DEBUG(const std::vector<std::vector<T> >& vv){if(DEBUG_OUT == false)return;for(const auto& v : vv){ DEBUG(v); } }
template<class T,class... Ts> void DEBUG(T d, Ts... e){if(DEBUG_OUT == false)return;DEBUG(d);DEBUG(e...);}
template <class T> void corner(bool flg, T hoge) {if (flg) {cout << hoge << endl; abort();}}
template< typename T1, typename T2 > inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }
template< typename T1, typename T2 > inline bool chmin(T1 &a, T2 b) { return a > b && (a = b, true); }

template< typename T >
size_t longest_increasing_subsequence(const vector< T > &a, bool strict,vector<int> &dp) {
  vector< T > lis;
  int cnt = 0;
  for(auto &p : a) {
    typename vector< T >::iterator it;
    if(strict) it = lower_bound(begin(lis), end(lis), p);
    else it = upper_bound(begin(lis), end(lis), p);
    if(end(lis) == it) lis.emplace_back(p);
    else *it = p;
    dp[cnt] = lis.size();
    cnt++;
  }
  return lis.size();
}

void solve(void)
{
  int n;cin>>n;
  vector<int> vec (n,0);
  for (int i = 0; i < n; i++)
  {
     cin>>vec[i];
  }
  vector<int> dp1 (n,0);
  vector<int> dp2 (n,0);
  longest_increasing_subsequence(vec,1,dp1);
  reverse(ALL(vec));

  
  longest_increasing_subsequence(vec,1,dp2);
  reverse(ALL(dp2));
  int res =0 ;
  for (int i = 0; i < n; i++)
  {
    int x = min(dp1[i],dp2[i]);
    x -=1;
    chmax(res,x);
  }
  reverse(ALL(vec));
  for (int i = 0; i < n; i++)
  {
    vec[i] *= -1;
  }
  for (int i = 0; i < n; i++)
  {
    dp1[i] = 0;
    dp2[i] = 0;
  }
  
  longest_increasing_subsequence(vec,1,dp1);
  reverse(ALL(vec));

  
  longest_increasing_subsequence(vec,1,dp2);
  reverse(ALL(dp2));
  for (int i = 0; i < n; i++)
  {
    int x = min(dp1[i],dp2[i]);
    x -=1;
    chmax(res,x);
  }
  // DEBUG(dp1,dp2);
  cout<<res<<endl;
  
 
  return;
}

int32_t main(int32_t argc, const char *argv[])
{
  std::ios::sync_with_stdio(false);
  std::cin.tie(0);

  std::cout << std::fixed;
  std::cout << std::setprecision(11);
  solve();

  return 0;
}