//subsir crescator maximal
#include <fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");

int n,nr,v[100099],l[100099],maxx,poz;

int main()
{
    f>>n;
    for (int i=1; i<=n; ++i)
    {
        f>>v[i];
        l[i]=1;
    }
    l[1]=1;
    for(int i=2; i<=n; ++i)
        for (int j=1; j<i; ++j)
        if (v[j]<v[i])
        {
            if (l[i]<l[j]+1)
            {
                l[i]=l[j]+1;
            }
        }
    maxx=1;
    for (int i=1; i<=n; ++i)
        if (l[i]>maxx)
        {
            maxx=l[i];
        }
    g<<maxx<<'\n';
    g.close(); f.close();
    return 0;
}