#include<fstream>
#include<algorithm>
using namespace std;
ifstream cin("scmax.in");
ofstream cout("scmax.out");
long long int n,pre[100001],v[100001],sol[100001];
int main()
{
    cin>>n;
    for(long long int i=1;i<=n;i++)
    {
        cin>>v[i];
        sol[i]=1;
    }
    for(long long int i=1;i<=n;i++)
    {long max1=0;
        for(long long int j=1;j<i;j++)
        {
            if(v[i]>v[j])
            {
                if(max1<sol[j]+1)
                {
                    sol[i]=sol[j]+1;
                    max1=sol[i];
                }
            }
        }
    }
    cout<<*max_element(sol+1,sol+n+1);
}