#include<bits/stdc++.h>
using namespace std;
int n,a[10004],dp[10004],m;
int main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i];
	}
	dp[1]=1;
	for(int i=2;i<=n;i++)
	{
		dp[i]=1;
		for(int j=1;j<=i;j++)
		{
			if(a[i]>a[j]) dp[i]=max(dp[i],dp[j]+1);
		}
	}
	for(int i=1;i<=n;i++)
	{
		m=max(m,dp[i]);
	}
	cout<<m;
} 
/**************************************************************
	Problem: 1794
	User: wuyunfeng
	Language: C++
	Result: Accepted
	Time:308 ms
	Memory:2152 kb
****************************************************************/