#include<bits/stdc++.h>
using namespace std;
vector<int> v;
int dp[100001],n,ans;
int x;
int main(){
	cin>>n;
	for(int i=0;i<=n-1;i++){
		cin>>x;
		v.push_back(x);
		dp[i]=1;
		for(int j=i-1;j>=0;j--){
			if(v[i]>v[j]){
				dp[i]=max(dp[i],dp[j]+1);
			}
			
		}
		ans=max(ans,dp[i]);
	}
	cout<<ans;
	return 0;
}

/**************************************************************
	Problem: 1893
	User: linyifan
	Language: C++
	Result: Time Limit Exceed
****************************************************************/