#include <fstream>
#define DIM 100010
using namespace std;
int v[DIM];
int d[DIM];
int n, i, j, maxim, sol;
int main () {
    ifstream fin ("scmax.in");
    ofstream fout("scmax.out");

    fin>>n;
    for (i=1;i<=n;i++)
        fin>>v[i];

    d[1] = 1;
    for (i=2;i<=n;i++) {
        maxim = 0;
        for (j=1;j<i;j++)
            if (v[j] < v[i] && d[j] > maxim)
                maxim = d[j];
        d[i] = maxim + 1;

        if (d[i] > sol)
            sol = d[i];
    }
    fout<<sol;

    return 0;
}