#include <iostream>
#include <algorithm>

using namespace std;

const int N = 1010;

int n;
int a[N];
int f[N];

int main()
{
    cin >> n ;
    for (int i = 1; i <= n; i ++ ) cin >> a[i];

    int res = 0;
    for (int i = 1; i <= n; i ++ )
    {
        f[i] = 1;
        for (int j = 1; j < i; j ++ )
            if (a[i] > a[j])
                f[i] = max(f[i], f[j] + 1);

        res = max(res, f[i]);
    }

    cout << res << endl;

    return 0;
}