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#include <bits/stdc++.h>
// #pragma GCC optimize ("O3")
// #pragma GCC target ("sse4")
using namespace std;

typedef long long LL;
typedef unsigned long long ULL;
typedef pair<int,int> PII;

#define REP(i,n) for(int i=0;i<(n);++i)
#define FOR(i,a,b) for (int i=(a); i<(b); ++i)
#define FORD(i,a,b) for (int i=(a)-1; i>=(b); --i)
#define MAX(dst,src) dst = max(dst, (src))
#define MIN(dst,src) dst = min(dst, (src))

#define pb push_back
#define mp make_pair
#define st first
#define nd second

const LL MOD = 226164873694399LL;
const int P = 67;
LL hashes[500005];

LL get(int X, vector<PII> xs) {
  vector<PII> events;
  REP(i,xs.size()) {
    events.pb({xs[i].st, i});
    events.pb({xs[i].nd, i});
  }
  sort(events.begin(), events.end());
  vector<pair<LL, int>> results;
  int k = 0;
  int lastX = 0;
  LL hash = 0;
  vector<bool> selected(xs.size());
  while (k < events.size()) {
    results.pb({hash, events[k].st - lastX});
    lastX = events[k].st;
    while (k < events.size() && events[k].st == lastX) {
      if (selected[events[k].nd]) hash += MOD - hashes[events[k].nd];
      else hash += hashes[events[k].nd];
      hash %= MOD;
      selected[events[k].nd] = !selected[events[k].nd];
      ++k;
    }
  }
  results.pb({hash, X - lastX});

  int result = 0;
  sort(results.begin(), results.end());
  int curresult = 0;
  LL curhash = -1;
  for (auto p: results) {
    if (p.st != curhash) {
      curhash = p.st;
      curresult = 0;
    }
    curresult += p.nd;
    MAX(result, curresult);
  }

  return result;
}

int main(int argc, char* argv[]) {
  hashes[0] = 1;
  FOR(i,1,500001) hashes[i] = hashes[i-1] * P % MOD;

  int N, X, Y;
  scanf("%d%d%d", &N, &X, &Y);
  vector<PII> xs, ys;
  REP(i,N) {
    int x1,y1,x2,y2;
    scanf("%d%d%d%d", &x1, &y1, &x2, &y2);
    xs.pb({x1, x2});
    ys.pb({y1, y2});
  }
  LL result = get(X, xs) * get(Y, ys);
  printf("%lld\n", result);
}