#include<bits/stdc++.h>
using namespace std;
int a[1001],n,f[1001],ans;
int main(){
	cin>>n;
	for (int i=1;i<=n;i++) cin>>a[i];
	f[1]=1;
	for (int i=2;i<=n;i++) for (int j=1;j<i;j++) if (a[j]<a[i]) f[i]=max(f[i],f[j]+1);
	for (int i=1;i<=n;i++) ans=max(ans,f[i]);
	cout<<ans;
}