#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  long long n;
  cin >> n;
  long long a[n];
  for (long long i = 0; i < n; i++) {
    cin >> a[i];
  }
  set<long long> s;
  s.insert(a[0]);
  long long ans = s.size();
  for (long long i = 1; i < n; i++) {
    if (a[i] > *s.rbegin()) {
      s.insert(a[i]);
    } else {
      auto it = lower_bound(s.begin(), s.end(), a[i]);
      if (it != s.end()) {
        s.erase(*it);
        s.insert(a[i]);
      }
    }
    ans = max(ans, (long long)s.size());
  }
  cout << ans << "\n";
  return 0;
}
