#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int a[n];
  for (int i = 0; i < n; i++) cin >> a[i];
  int dp[n];
  dp[0] = 1;
  int ans = 1;
  for (int i = 1; i < n; i++) {
    for (int j = 0; j < i; j++) {
      if (a[i] > a[j]) {
        dp[i] = dp[j] + 1;
      } else {
        dp[i] = dp[j];
      }
    }
    ans = max(ans, dp[i]);
  }
  cout << ans << endl;
  return 0;
}
