#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int main()
{int n,v[100002],lung[100002],i,lmax=1,j,l;
fin>>n;
for(i=1; i<=n; i++)
{
    fin>>v[i];
}
for(i=n-1; i>=1; i--)
{
    j=i+1;
    l=0;
    while(j<=n)
    {
        if(v[j]>v[i])
        {
            if(lung[j]>l)
            {
                l=lung[j];
            }
        }
        j++;
    }
    lung[i]=l+1;
    if(lung[i]>lmax)
    {
        lmax=lung[i];
    }
}
fout<<lmax;

    return 0;
}