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#include <bits/stdc++.h>
using namespace std;

#define PII pair<int, int>
#define VI vector<int>
#define VPII vector<PII>
#define LL long long
#define LD long double
#define f first
#define s second
#define MP make_pair
#define PB push_back
#define endl '\n'
#define ALL(c) (c).begin(), (c).end()
#define SIZ(c) (int)(c).size()
#define REP(i, n) for (int i = 0; i < (int)(n); i++)
#define FOR(i, b, e) for (int i = (b); i <= (int)(e); i++)
#define FORD(i, b, e) for (int i = (b); i >= (int)(e); i--)
#define ll long long
#define st f
#define nd s
#define pb PB
#define eb emplace_back
#define mp make_pair				
#define siz(c) SIZ(c)
const int inf = 1e9 + 7;
const LL INF = 1e18L + 7;
 
#define sim template<class n
sim, class s> ostream & operator << (ostream &p, pair<n, s> x)
{return p << "<" << x.f << ", " << x.s << ">";}
sim> auto operator << (ostream &p, n y) ->
typename enable_if<!is_same<n, string>::value, decltype(y.begin(), p)>::type
{int o = 0; p << "{"; for (auto c : y) {if (o++) p << ", "; p << c;} return p << "}";}
void dor() {cerr << endl;}
sim, class...s> void dor(n p, s...y) {cerr << p << " "; dor(y...);}
sim, class s> void mini(n &p, s y) {if (p > y) p = y;}
sim, class s> void maxi(n &p, s y) {if (p < y) p = y;}

#ifdef DEB
#define debug(...) dor(__FUNCTION__, ":", __LINE__, ": ", __VA_ARGS__)
#else
#define debug(...)
#endif

#define I(x) #x " = ", (x), " "
#define A(a, i) #a "[" #i " = ", i, "] = ", a[i], " "

#ifndef LOCAL
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace __gnu_pbds;

template <typename T>
using ordered_set =
	tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

#else
#include</Users/dawid/algo/mac/ordered_set>
#endif

#define int ll
#define y1 slmqmsqslqmsq
const int N = 1<<20;

int n, X, Y;

int x1[N];
int x2[N];
int y1[N];
int y2[N];

int l[N];
int r[N];

int load[2*N];
int Min[2*N];
int cnt[2*N];

VI zaczyna[N];
VI konczy[N];

VI val;

void merge(int v)
{
	if(Min[2*v]==Min[2*v+1])
	{
		Min[v] = Min[2*v];
		cnt[v] = cnt[2*v] + cnt[2*v+1];
	}
	else if(Min[2*v]<Min[2*v+1])
	{
		Min[v] = Min[2*v];
		cnt[v] = cnt[2*v];
	}
	else
	{
		Min[v] = Min[2*v+1];
		cnt[v] = cnt[2*v+1];
	}

	Min[v] += load[v];
}

void insert(int a, int b, int c, int v = 1, int l = 0, int r = N-1) 
{
	if(a>r || l>b)
		return;

	if(a<=l && r<=b)
	{
		load[v] += c;
		Min[v] += c;
		return;
	}

	insert(a, b, c, 2*v, l, (l+r)/2);
	insert(a, b, c, 2*v+1, (l+r)/2+1, r);
	merge(v);
}

void clear()
{
	memset(Min, 0, sizeof Min);
	memset(load, 0, sizeof load);
	memset(cnt, 0, sizeof cnt);
	val.clear();

	for(int i = 0; i < N; ++i)
	{
		zaczyna[i].clear();
		konczy[i].clear();
	}
}

int solve(int M)
{
	for(int i = 1; i <= n; ++i)
	{
		val.pb(l[i]);
		val.pb(r[i]);
	}

	val.pb(M);
	val.pb(0);

	sort(ALL(val));
	val.erase(unique(ALL(val)), val.end());

	for(int i = 0; i+1 < siz(val); ++i)
	{
		cnt[i+N] = val[i+1] - val[i];
	}

	for(int i = siz(val)-1; i < N; ++i)
	{
		cnt[i] = 1;
		Min[i] = inf;
	}

	for(int i = N-1; i >= 1; --i)
	{
		merge(i);
	}

	//debug(val); 

	for(int i = 1; i <= n; ++i)
	{
		l[i] = lower_bound(ALL(val), l[i]) - val.begin();
		r[i] = lower_bound(ALL(val), r[i]) - val.begin();

		insert(l[i], r[i]-1, 1);
		//debug(l[i], r[i]);

		zaczyna[l[i]].pb(i);
		konczy[r[i]].pb(i);
	}

	int ans = 0;

	for(int i = 0; i+1 < siz(val); ++i)
	{
		for(auto it:zaczyna[i])
		{
			insert(l[it], r[it]-1, -1);
			insert(0, l[it]-1, 1);
			insert(r[it], siz(val)-2, 1);
		}

		for(auto it:konczy[i])
		{
			insert(l[it], r[it]-1, 1);
			insert(0, l[it]-1, -1);
			insert(r[it], siz(val)-2, -1);
		}

		if(Min[1]==0)
			ans = max(ans, cnt[1]);
	}

	clear();
	return ans;
}

int32_t main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(NULL);

	cin >> n >> X >> Y;

	for(int i = 1; i <= n; ++i)
	{
		cin >> x1[i] >> y1[i] >> x2[i] >> y2[i];

		if(x1[i] > x2[i])
			swap(x1[i], x2[i]);

		if(y1[i] > y2[i])
			swap(y1[i], y2[i]);

		l[i] = x1[i];
		r[i] = x2[i];
	}

	int ans_x = solve(X);
	//debug(ans_x);

	for(int i = 1; i <= n; ++i)
	{
		l[i] = y1[i];
		r[i] = y2[i];
	}

	int ans_y = solve(Y);

	cout << ans_x * ans_y << endl;
}