#include<fstream>
using namespace std;
#define NM 100010
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int v[NM],l[NM];
int main() {
	int n,i,j,lc,max=0;
	fin>>n;
	for(i=1;i<=n;i++) fin>>v[i];
	l[n]=1;
	for(i=n-1;i>0;i--) {
		lc=0;
		for(j=i+1;j<=n;j++) 
			if(v[i]<v[j]&&lc<l[j]) lc=l[j];
		l[i]=lc+1;
			if(l[i]>max) max=l[i];
	}
	fout<<max<<"\n";
	return 0;
}