#include<bits/stdc++.h>
using namespace std;

typedef long long int ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pair<int, int> > vii;
#define rrep(i, m, n) for(int (i)=(m); (i)<(n);  (i)++)
#define erep(i, m, n) for(int (i)=(m); (i)<=(n); (i)++)
#define  rep(i, n)    for(int (i)=0; (i)<(n);  (i)++)
#define  rev(i, n)    for(int (i)=(n)-1; (i)>=0; (i)--)
#define vrep(i, c)    for(__typeof((c).begin())i=(c).begin(); i!=(c).end(); i++)
#define  ALL(v)       (v).begin(), (v).end()
#define mp            make_pair
#define pb            push_back
template<class T1, class T2> inline void minup(T1& m, T2 x){ if(m>x) m=static_cast<T2>(x); }
template<class T1, class T2> inline void maxup(T1& m, T2 x){ if(m<x) m=static_cast<T2>(x); }

#define INF 1000000000
#define MOD 1000000007
#define EPS 1E-12

const int MAX_N = 3000;
int n;
int A[MAX_N];
int dp[2][MAX_N][MAX_N];

int lsolve(int L, int R);
int rsolve(int L, int R);

int lsolve(int L, int R)
{
  if(dp[0][L][R]) return dp[0][L][R];
  if(L == R) return dp[0][L][R] = 1;
  if(A[L] >= A[R]) return dp[0][L][R] = lsolve(L, R-1);
  return dp[0][L][R] = max(lsolve(L, R-1), rsolve(L+1, R)+1);
}

int rsolve(int L, int R)
{
  if(dp[1][L][R]) return dp[1][L][R];
  if(L == R) return dp[1][L][R] = 1;
  if(A[L] <= A[R]) return dp[1][L][R] = rsolve(L+1, R);
  return dp[1][L][R] = max(rsolve(L+1, R), lsolve(L, R-1)+1);
}

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

  cout << lsolve(0, n-1) << endl;

  return 0;
}