#include <iostream>
#include <fstream>
#define nmax 100001
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,i;
long long a[nmax];
int LIS()
{
	int i,j,lis[nmax],nr;
	for(i=1;i<=n;i++)lis[i]=1;
	for(i=2;i<=n;i++)
	 for(j=1;j<=i-1;j++)
	  if(a[j]<a[i] && lis[i]<lis[j]+1)lis[i]=lis[j]+1;
	for(i=1;i<=n;i++)nr=max(nr,lis[i]);
	return nr;
}
int main()
{
	fin>>n;
	for(i=1;i<=n;i++)fin>>a[i];
	fout<<LIS()<<endl;
	return 0;
}