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#ifndef LOCAL
#pragma GCC optimize ("O3")
#endif

#include <bits/stdc++.h>

using namespace std;

#define sim template < class c
#define ris return * this
#define dor > debug & operator <<
#define eni(x) sim > typename \
enable_if<sizeof dud<c>(0) x 1, debug&>::type operator<<(c i) {
sim > struct rge { c b, e; };
sim > rge<c> range(c i, c j) { return {i, j}; }
sim > auto dud(c* x) -> decltype(cerr << *x, 0);
sim > char dud(...);
struct debug {
#ifdef LOCAL
~debug() { cerr << endl; }
eni(!=) cerr << boolalpha << i; ris; }
eni(==) ris << range(begin(i), end(i)); }
sim, class b dor(pair < b, c > d) {
  ris << "(" << d.first << ", " << d.second << ")";
}
sim dor(rge<c> d) {
  *this << "[";
  for (c it = d.b; it != d.e; ++it)
    *this << ", " + 2 * (it == d.b) << *it;
  ris << "]";
}
#else
sim dor(const c&) { ris; }
#endif
};
#define imie(x...) " [" #x ": " << (x) << "] "

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
template <typename A, typename B>
using unordered_map2 = __gnu_pbds::gp_hash_table<A, B>;
using namespace __gnu_pbds;
template <typename T> using ordered_set =
  __gnu_pbds::tree<T, __gnu_pbds::null_type, less<T>, __gnu_pbds::rb_tree_tag,
                   __gnu_pbds::tree_order_statistics_node_update>;
// ordered_set<int> s; s.insert(1); s.insert(2);
// s.order_of_key(1);    // Out: 0.
// *s.find_by_order(1);  // Out: 2.

using ld = long double;
using ll = long long;

constexpr int mod = 1000 * 1000 * 1000 + 7;
constexpr int odw2 = (mod + 1) / 2;

void OdejmijOd(int& a, int b) { a -= b; if (a < 0) a += mod; }
int Odejmij(int a, int b) { OdejmijOd(a, b); return a; }
void DodajDo(int& a, int b) { a += b; if (a >= mod) a -= mod; }
int Dodaj(int a, int b) { DodajDo(a, b); return a; }
int Mnoz(int a, int b) { return (ll) a * b % mod; }
void MnozDo(int& a, int b) { a = Mnoz(a, b); }
int Pot(int a, ll b) { int res = 1; while (b) { if (b % 2 == 1) MnozDo(res, a); a = Mnoz(a, a); b /= 2; } return res; }
int Odw(int a) { return Pot(a, mod - 2); }
void PodzielDo(int& a, int b) { MnozDo(a, Odw(b)); }
int Podziel(int a, int b) { return Mnoz(a, Odw(b)); }
int Moduluj(ll x) { x %= mod; if (x < 0) x += mod; return x; }

template <typename T> T Maxi(T& a, T b) { return a = max(a, b); }
template <typename T> T Mini(T& a, T b) { return a = min(a, b); }

class Timer {
 public:
  Timer() {
    begin_ = clock();
  }

  double Get() const {
    return double(clock() - begin_) / CLOCKS_PER_SEC;
  }

 private:
  clock_t begin_;
};

class Drzewo {
 public:
  Drzewo(const vector<int>& punkty) {
    debug() << "Drzewo(" imie(punkty) ")";
    n2_ = 1;
    while (n2_ < (int) punkty.size()) {
      n2_ *= 2;
    }
    nodes_ = unique_ptr<Node[]>(new Node[n2_ * 2]);
    for (int i = 1; i < (int) punkty.size(); i++) {
      nodes_[n2_ + i - 1].best_val_length = punkty[i] - punkty[i - 1];
    }
    for (int i = n2_ - 1; i >= 1; i--) {
      nodes_[i].best_val_length =
          nodes_[i * 2].best_val_length + nodes_[i * 2 + 1].best_val_length;
    }
    Wypisz();
  }

  void DodajCaly(int val) {
    a_ = 0;
    b_ = n2_ - 1;
    val_ = val;
    Dodaj_(1, 0, n2_ - 1);
  }

  void Dodaj(int a, int b, int val) {
    debug() << "Drzewo::Dodaj(" imie(a) imie(b) imie(val) ")";
    a_ = a;
    b_ = b - 1;
    if (a_ > b_) return;
    val_ = val;
    Dodaj_(1, 0, n2_ - 1);
    Wypisz();
  }

  int Get(int n) const {
    debug() << "Drzewo::Get(" imie(n) ") = {" imie(nodes_[1].spu)
               imie(nodes_[1].max_val) imie(nodes_[1].best_val_length) "}";
    assert(nodes_[1].max_val == n);
    return nodes_[1].best_val_length;
  }

 private:
  struct Node {
    int spu = 0;
    int max_val = 0;
    int best_val_length = 0;
  };

  void Wypisz() const {
    #ifdef LOCAL
    for (int i = 1; i < n2_ * 2; i++) {
      debug() << imie(i) imie(nodes_[i].spu) imie(nodes_[i].max_val)
                 imie(nodes_[i].best_val_length);
    }
    #endif
  }

  void Spusc(int w) {
    if (int& spu = nodes_[w].spu) {
      nodes_[w].max_val += spu;
      if (w < n2_) {
        nodes_[w * 2].spu += spu;
        nodes_[w * 2 + 1].spu += spu;
      }
      spu = 0;
    }
  }

  void Dodaj_(int w, int p, int k) {
    Spusc(w);
    if (k < a_ or b_ < p) {
      return;
    }
    Node& node = nodes_[w];
    if (a_ <= p and k <= b_) {
      node.spu += val_;
      Spusc(w);
      return;
    }
    Dodaj_(w * 2, p, (p + k) / 2);
    Dodaj_(w * 2 + 1, (p + k) / 2 + 1, k);
    const Node& l = nodes_[w * 2];
    const Node& r = nodes_[w * 2 + 1];
    if (l.max_val < r.max_val) {
      node.max_val = r.max_val;
      node.best_val_length = r.best_val_length;
    } else if (r.max_val < l.max_val) {
      node.max_val = l.max_val;
      node.best_val_length = l.best_val_length;
    } else {
      node.max_val = l.max_val;
      node.best_val_length = l.best_val_length + r.best_val_length;
    }
  }

  int a_, b_, val_;
  int n2_;
  unique_ptr<Node[]> nodes_;
};

int Rozwiaz(vector<pair<int, int>>& pary, int m) {
  const int n = (int) pary.size();
  debug() << imie(m) imie(n) imie(pary);
  // Timer sort_timer;
  vector<int> punkty = {0, m};
  for (const auto& [a, b] : pary) {
    assert(0 <= a and a <= b and b < m);
    punkty.push_back(a);
    punkty.push_back(b);
  }
  sort(punkty.begin(), punkty.end());
  punkty.erase(unique(punkty.begin(), punkty.end()), punkty.end());
  // cout << imie(sort_timer.Get()) << endl;

  auto Znajdz = [&punkty](int x) -> int {
    return lower_bound(punkty.begin(), punkty.end(), x) - punkty.begin();
  };

  Drzewo drzewo(punkty);
  auto DodajPrzedzial = [&drzewo, &pary](int i, int waga) -> void {
    debug() << "DodajPrzedzial(" imie(i) imie(waga) ")";
    if (!waga) return;
    const auto& [a, b] = pary[i];
    drzewo.Dodaj(a, b, waga);
  };
  auto DodajCalosc = [&drzewo, &punkty](int waga) -> void {
    debug() << "DodajCalosc(" imie(waga) ")";
    if (!waga) return;
    drzewo.DodajCaly(waga);
  };

  vector<vector<int>> poczatki(punkty.size()), konce(punkty.size());
  // Timer znajdowanie_timer;
  DodajCalosc(pary.size());
  for (int i = 0; i < (int) pary.size(); i++) {
    auto& [a, b] = pary[i];
    a = Znajdz(a);
    b = Znajdz(b);
    poczatki[a].push_back(i);
    konce[b].push_back(i);
    DodajPrzedzial(i, -1);
  }
  // cout << imie(znajdowanie_timer.Get()) << endl;
  assert((int) punkty.size() >= 2);
  assert(punkty.back() == m);
  int wynik = 0;
  // Timer petla_time;
  for (int i = 0; i + 1 < (int) punkty.size(); i++) {
    DodajCalosc((int) konce[i].size() - (int) poczatki[i].size());
    for (int p : poczatki[i]) {
      DodajPrzedzial(p, 2);
    }
    for (int k : konce[i]) {
      DodajPrzedzial(k, -2);
    }
    const int mam = drzewo.Get(n);
    debug() << imie(punkty[i]) imie(mam);
    Maxi(wynik, mam);
  }
  // cout << imie(petla_time.Get()) << endl;
  return wynik;
}

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n, X, Y;
  n = 500 * 1000;
  X = 1000 * 1000 * 1000;
  Y = 1000 * 1000 * 1000;
  cin >> n >> X >> Y;
  //scanf("%d%d%d", &n, &X, &Y);
  vector<pair<int, int>> xx(n), yy(n);
  for (int i = 0; i < n; i++) {
    // xx[i].first = rand() % X;
    // xx[i].second = xx[i].first;
    // while (xx[i].second == xx[i].first) xx[i].second = rand() % X;
    // yy[i].first = rand() % Y;
    // yy[i].second = yy[i].first;
    // while (yy[i].second == yy[i].first) yy[i].second = rand() % Y;
    cin >> xx[i].first >> yy[i].first >> xx[i].second >> yy[i].second;
    //scanf("%d%d%d%d", &xx[i].first, &yy[i].first, &xx[i].second, &yy[i].second);
    if (xx[i].first > xx[i].second) {
      swap(xx[i].first, xx[i].second);
    }
    if (yy[i].first > yy[i].second) {
      swap(yy[i].first, yy[i].second);
    }
  }
  // Timer timer;
  const ll wynik_xx = Rozwiaz(xx, X);
  // cout << imie(timer.Get()) << endl;
  // Timer timer2;
  const ll wynik_yy = Rozwiaz(yy, Y);
  // cout << imie(timer2.Get()) << endl;
  cout << wynik_xx * wynik_yy << endl;
  //printf("%lld\n", wynik_xx * wynik_yy);
  return 0;
}