#include <cstdio>
#include <iostream>
#include <fstream>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <bitset>
#include <algorithm>
#include <sstream>
#include <iomanip>
#include <cmath>
#include <cstdlib>
#include <ctype.h>
#include <cstring>
#include <string>
#include <ctime>
#include <cassert>
#include <utility>

using namespace std;

#define LIM 100005

int dp[LIM];

int main() {
	freopen("scmax.in", "r", stdin);
	freopen("scmax.out","w", stdout);

    int n, a[LIM];

    cin >> n;

    for(int i = 0; i < n; i++) {
        cin >> a[i];
    }

    for(int i = 0; i < n; i++) {
        dp[i] = 1;
    }

    for(int i = 0; i < n; i++) {
        int mx = 0;
        for(int j = 0; j < i; j++) {
            if(a[j] < a[i] && dp[j] > mx) {
                mx = dp[j];
            }
        }
        dp[i] = max(dp[i], 1 + mx);
    }

    cout << dp[n - 1] << "\n";

	return 0;
}