#include <iostream>
#include <fstream>
using namespace std;
ifstream in("scmax.in");
ofstream out("scmax.out");
int main()
{
    int n;
    in>>n;
    int v[n+1];
    for(int i=1; i<=n; i++)
        in>>v[i];
    int d[n+1];
    d[n]=1;
    int mx=1;
    for(int i=n-1;i>=1;i--)
    {
        d[i]=1;
        for(int j=i+1;j<=n;j++)
            if(v[i]<v[j] && d[i]<d[j]+1)
            {
                d[i]=d[j]+1;
                if(mx<d[i])
                    mx=d[i];
            }
    }
    out<<mx;
    return 0;
}