#include<bits/stdc++.h>
using namespace std;
int n,ans;

int main(){
	cin>>n;
	int a[n],dp[n];
	for(int i=1;i<=n;i++){
		cin>>a[i];
		dp[i]=1;
		for(int j=1;j<=i;j++){
			if(a[j]>a[i]){
				if(dp[j]+1>dp[i]) dp[i]=dp[j]+1;
			}
		}
		ans=max(ans,dp[i]);
		
	}
	cout<<ans;
	return 0;
}

/**************************************************************
	Problem: 1795
	User: huangsheng
	Language: C++
	Result: Accepted
	Time:19 ms
	Memory:2072 kb
****************************************************************/