#include <bits/stdc++.h>
using namespace std;
const int N = 1e4 + 5;
int a[N],dp[N],nmax;
int main(){
	int n;
	cin >> n;
	for(int i = 1;i <= n;i++){
		cin >> a[i];
	}
	for(int i = 1;i <= n;i++){
		dp[i] = 1;
		for(int j = 1;j < i;j++){
			if(a[j] < a[i]){
				dp[i] = max(dp[i],dp[j] + 1);
			}
		}
		nmax = max(nmax,dp[i]);
	}
	cout << nmax;
	return 0;
}