#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
int main() {
    int n;
    cin >> n;
    vector<int>a(n), dp(n);
    int ans = 0;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    for (int i = 0; i < n; i++) {
        dp[i] = 1;
        for (int j = 0; j < i; j++) {
            if (a[j] < a[i]) {
                dp[i] = max(dp[i], dp[j] + 1);

                ans = max(ans, dp[i]);
            }
        }
    }
    cout << ans;
}