#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int lengthOfLIS(vector<int>& nums) {
    int n = nums.size();
    vector<int> dp(n, 1);
    for (int i = 1; i < n; ++i) {
        for (int j = 0; j < i; ++j) {
            if (nums[j] < nums[i]) {
                dp[i] = max(dp[i], dp[j] + 1);
            }
        }
    }
    return *max_element(dp.begin(), dp.end());
}

int main() {
    int n;
    cin >> n;
    vector<int> nums(n);
    for (int i = 0; i < n; ++i) {
        cin >> nums[i];
    }
    cout << lengthOfLIS(nums) << endl;
    return 0;
}
/**************************************************************
	Problem: 1893
	User: chenyubo
	Language: C++
	Result: Time Limit Exceed
****************************************************************/