#include <iostream>
#include <unordered_set>
#include <vector>
#include <set>
using namespace std;

int main() {
    int n = 0;
    cin >> n;
    vector<int> v(n);
    for (int i=0;i<n;++i) {
        cin >> v[i];
    }
    vector<int> dp(n,1);
    int imax = 1;
    for (int i=1;i<n;++i) {
        for (int j=0;j<i;++j) {
            if (v[i] > v[j] && dp[i] < dp[j] + 1) {
                dp[i] = dp[j] + 1;
                imax = max(imax, dp[i]);
            }
        }
    }
    cout << imax;
}