ABC006_D.cpp

#include <bits/stdc++.h>

using namespace std;

#define int long long
#define all(v) begin(v), end(v)
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define reps(i, s, n) for(int i = (int)(s); i < (int)(n); i++)
#define min(...) min({__VA_ARGS__})
#define max(...) max({__VA_ARGS__})

const int inf = 1LL << 55;
const int mod = 1e9 + 7;

signed main()
{
  cin.tie(0);
  ios_base::sync_with_stdio(0);
  cout << fixed << setprecision(12);

  int n, c[30000];
  cin >> n;
  rep(i, n) cin >> c[i];

  int dp[30030];
  fill(dp, dp + n, inf);
  rep(i, n) {
    *lower_bound(dp, dp + n, c[i]) = c[i];
  }
  cout << n - (lower_bound(dp, dp + n, inf) - dp) << endl;

  return 0;
}