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#include <bits/stdc++.h> // Tomasz Nowak
using namespace std;     // XIII LO Szczecin
using LL = long long;    // Poland
#define FOR(i, l, r) for(int i = (l); i <= (r); ++i)
#define REP(i, n) FOR(i, 0, (n) - 1)
mt19937_64 rng(0);
int rd(int l, int r) {
	return uniform_int_distribution<int>(l, r)(rng);
}

int inf = 0x3f3f3f3f;

struct Tree {
	int s = 1;
	vector<int> val, cnt, to_add;

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

	Tree(vector<int> w) {
		int n = int(w.size());
		while(s < n)
			s *= 2;
		val = cnt = to_add = vector<int>(2 * s);
		fill(val.begin(), val.end(), -inf);
		REP(i, n)
			val[i + s] = 0;
		REP(i, n)
			cnt[i + s] = w[i];
		for(int v = s - 1; v > 0; --v)
			merge(v);
	}

	void add(int l, int r, int x) {
		l += s;
		r += s;
		val[l] += x;
		if(l != r)
			val[r] += x;

		while(l != 1) {
			if(l / 2 != r / 2) {
				if(~l & 1) {
					val[l + 1] += x;
					to_add[l + 1] += x;
				}
				if(r & 1) {
					val[r - 1] += x;
					to_add[r - 1] += x;
				}
			}
			merge(l / 2);
			if(l / 2 != r / 2)
				merge(r / 2);
			l /= 2;
			r /= 2;
		}
	}

	int get() {
		return cnt[1];
	}
};

int solve(int n, int X, vector<array<int, 2>> &in) {
	vector<int> sorted = {0, X - 1, X};
	for(auto p : in)
		for(int x : p) {
			sorted.emplace_back(x);
			sorted.emplace_back(x + 1);
		}
	sort(sorted.begin(), sorted.end());

	vector<int> nodup = {sorted[0]};
	FOR(i, 1, int(sorted.size()) - 1)
		if(sorted[i] != sorted[i - 1])
			nodup.emplace_back(sorted[i]);
	X = int(nodup.size());
	vector<int> len(X - 1);
	REP(i, X - 1)
		len[i] = nodup[i + 1] - nodup[i];

	auto scaled = [&](int x) {
		return int(distance(nodup.begin(), lower_bound(nodup.begin(), nodup.end(), x)));
	};
	for(auto &p : in)
		for(int &x : p)
			x = scaled(x);
	Tree tree(len);

	vector<vector<int>> last(X);
	REP(i, n) {
		last[in[i][0]].emplace_back(i);
		last[in[i][1] + 1].emplace_back(i);
	}

	auto add = [&](int i, int val) {
		tree.add(in[i][0], in[i][1], val);
	};
	REP(i, n)
		add(i, -1);

	int ret = 0;
	REP(x, X) {
		for(int i : last[x]) 
			add(i, x == in[i][0] ? 2 : -2);
		ret = max(ret, tree.get());
	}
	return ret;
}

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

	int n, X, Y;
	cin >> n >> X >> Y;
	//n = 500000;
	//X = Y = int(1e9);
	array<vector<array<int, 2>>, 2> in;
	REP(d, 2)
		in[d].resize(n);
	REP(i, n) {
		array<array<int, 2>, 2> a = {in[0][i], in[1][i]};
		cin >> a[0][0] >> a[1][0] >> a[0][1] >> a[1][1];
		//REP(d, 2)
			//REP(dd, 2)
				//a[d][dd] = rd(0, int(1e9) - 1);
		REP(d, 2) {
			if(a[d][0] > a[d][1])
				swap(a[d][0], a[d][1]);
			--a[d][1];
		}
		REP(d, 2)
			REP(dd, 2)
				in[d][i][dd] = a[d][dd];
	}

	cout << solve(n, X, in[0]) * LL(solve(n, Y, in[1])) << '\n';
}