#include <bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	int a[n+1],c[n+1];
	memset(c,0,sizeof(c));
	int ans=0,cmp=0;
	c[1]=1;
	for(int i=1;i<=n;i++)
	{
		cin>>a[i];
		for(int j=i-1;j>=1;j--)
		{
			if(a[j]<a[i]&&c[j]>cmp){
				cmp=c[j];
				c[i]=c[j]+1;
				ans=max(ans,c[i]);
			}
			else
				
				continue;
		} 
		cmp=0;
	}
	cout<<ans;
	return 0;
}