#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ul;
typedef signed long long ll;
ul over = 1000000007;

int main(void)
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed;
  ll n;
  cin >> n;
  ll a[n];
  for (ll i = 0; i < n; ++i) cin >> a[i];
  ll dp[n];
  ll Inf = n+1;
  for (ll i = 0; i < n; ++i) dp[i] = Inf;
  for (ll i = 0; i < n; ++i) {
    *lower_bound(dp, dp+n, a[i]) = a[i];
  }
  cout << n - (lower_bound(dp, dp+n, Inf) - dp) << endl;
  return 0;
}