#include <fstream>

using namespace std;

ifstream cin("scmax.in");
ofstream cout("scmax.out");

int main()
{
    int n,i,j,a[100001],lis[10001],nr[100001],maxx;
    cin>>n;
    for(i=1;i<=n;i++)
        cin>>a[i];
    lis[n]=1;
    for(i=n-1;i>=1;i--)
    {
        maxx=0;
        for(j=i+1;j<=n;j++)
            if(maxx<lis[j]&&a[i]<a[j])
                maxx=lis[j];
        lis[i]=maxx+1;
    }
    maxx=0;
    for(i=1;i<=n;i++)
    {
        if(maxx<lis[i])
            maxx=lis[i];
    }
    cout<<maxx;
}