#include <iostream>
#include <fstream>

using namespace std;

long long x[100001];
int n,lis[100001],maxx,maxs;
int main()
{
    int i,j;
    freopen("scmax.in","r",stdin);
    freopen("scmax.out","w",stdout);
    cin>>n;
    for(i=1;i<=n;i++)
        cin>>x[i];
    lis[n]=1;
    for(i=n-1;i>=1;i--)
    {
        maxx=0;
        for(j=i+1;j<=n;j++)
        {
            if(x[i]<x[j] && maxx<=lis[j])
            {
                maxx=lis[j];
            }
        }
        lis[i]=maxx+1;
        if(lis[i]>maxs) maxs=lis[i];
    }
    cout<<maxs;

    cout<<"\n";
    return 0;
}