#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <numeric>
#include <functional>
#include <cmath>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <sstream>
#include <string>
#define repd(i,a,b) for (int i=(a);i<(b);i++)
#define rep(i,n) repd(i,0,n)
#define var auto
#define mod 1000000007
#define inf 2147483647
#define mp make_pair
#define pb push_back
typedef long long ll;
using namespace std;

template <typename T>
inline void output(T a, int p) {
    if(p){
        cout << fixed << setprecision(p)  << a << "\n";
    }
    else{
        cout << a << "\n";
    }
}
// end of template

int main() {
    cin.tie(0);
    ios::sync_with_stdio(0);
    // source code
    int N;
    cin >> N;
    vector<int> A(N);
    rep(i, N){
        cin >> A[i];
    }
    
    vector<vector<int>> dpl(2, vector<int>(N, 1)), dpr(2, vector<int>(N, 1));
    
    int ret = 0;
    repd(i, 1, N){
        rep(j, N - i){
            dpl[0][j] = dpl[1][j];
            if (A[j] < A[i + j]) {
                dpl[0][j] = max(dpl[0][j], dpr[1][j + 1] + 1);
            }
            dpr[0][j] = dpr[1][j + 1];
            if (A[j] > A[i + j]) {
                dpr[0][j] = max(dpl[1][j] + 1, dpr[0][j]);
            }
            ret = max(ret, max(dpl[0][j], dpr[0][j]));
        }
        dpl[1] = dpl[0];
        dpr[1] = dpr[0];
    }
    output(ret, 0);
    
    return 0;
}