#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");

const int Nmax=100005;
int N,X[Nmax],DP[Nmax],Max,Max2;

void Read()
{
    fin>>N;
    for(int i=1;i<=N;++i)
        fin>>X[i];
}

void Solve()
{
    for(int i=1;i<=N;++i)
    {
        Max=0;
        for(int j=1;j<=N;++j)
            if(X[j]<X[i] && DP[j]>Max)
                Max=DP[j];
            DP[i]=1+Max;
    }
    for(int i=1;i<=N;++i)
    {
        if(DP[i]>Max2)
            Max2=DP[i];
    }
    fout<<Max2;
}

int main()
{
    Read(); Solve();
    return 0;
}