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#include <bits/stdc++.h> 

using namespace std;

#define For(i, n) for (int i = 0; i < int(n); i++)
#define ForD(i, n) for (int i = int(n) - 1; i >= 0; i--)
#define SORT(x) sort(begin(x), end(x))
#define REP(i, begin, end) for (__typeof(end) i = (begin) - ((begin) > (end)); i != (end) - ((begin) > (end)); i += 1 - 2 * ((begin) > (end)))

template<typename T, typename U>
pair<T, U>& operator+=(pair<T, U> &lhs, const pair<T, U> &rhs){
	lhs.first += rhs.first;
	lhs.second += rhs.second;
	return lhs;
}

template<typename T, typename U>
pair<T, U>& operator-=(pair<T, U> &lhs, const pair<T, U> &rhs){
	lhs.first -= rhs.first;
	lhs.second -= rhs.second;
	return lhs;
}

template <class T> ostream &operator<<(ostream &os, const vector<T> &container) {
	for (auto &u : container) os << u << " ";
	return os;
}

template <class T, class U> ostream &operator<<(ostream &os, const pair<T, U> &p) {
	os << p.first << " " << p.second;
	return os;
}

#include <ext/pb_ds/assoc_container.hpp> // Common file
#include <ext/pb_ds/tree_policy.hpp> // Including tree_order_statistics_node_update
// #include <ext/pb_ds/detail/standard_policies.hpp>

using namespace __gnu_pbds; 
using namespace std; 

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

#if DEBUG
#define error(args...) { string _s = #args; replace(_s.begin(), _s.end(), ',', ' '); stringstream _ss(_s); istream_iterator<string> _it(_ss); err(_it, args); }
void err(istream_iterator<string>) {}
template<typename T, typename... Args>
void err(istream_iterator<string> it, T a, Args... args) {
	cerr << *it << " = " << a << endl;
	err(++it, args...);
}
#else
#define error(...) do {} while (0)
#endif

template<typename T, typename U>
pair<T, U> operator-(const pair<T, U> &l, const pair<T, U> &r) {
	return {l.first - r.first, l.second - r.second};
}
template<typename T, typename U>
pair<T, U> operator+(const pair<T, U> &l, const pair<T, U> &r) {
	return {l.first + r.first, l.second + r.second};
}

#define _upgrade do { ios::sync_with_stdio(0); cin.tie(0); } while (0)

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

int X, Y;
int n;

typedef pair<pii, pii> rect;

inline ll area(const rect &r) {
    ll dx = r.second.first - r.first.first;
    ll dy = r.second.second - r.first.second;
    
    if (dx <= 0 || dy <= 0) return 0;
    return dx * dy;
}

inline rect intersection(const rect &a, const rect &b) {
    pii tl = {max(a.first.first, b.first.first), max(a.first.second, b.first.second)};
    pii br = {min(a.second.first, b.second.first), min(a.second.second, b.second.second)};
    return {tl, br};
}

inline vector<rect> gen_rects(pii tl, pii br, int which) {
    if (which == 0) {
        // vertical
        return {
            {{tl.first, 0}, {br.first, tl.second}},
            {{tl.first, br.second}, {br.first, Y}}
        };
    } else if (which == 1) {
        // horizontal 
        return {
            {{0, tl.second}, {tl.first, br.second}},
            {{br.first, tl.second}, {X, br.second}}
        };
    } else if (which == 2) {
        // center 
        return { {tl, br } };
    } else {
        // outside
        return {
            {{0, 0}, tl},
            {{br.first, 0}, {X, tl.second}},
            {{0, br.second}, {tl.first, Y}},
            {br, {X, Y}}
        };
    }
}

int main() {
	_upgrade;

    cin >> n >> X >> Y;

    vector<vector<rect>> sols;
    For (i, n) {
        int aa, b, c, d;
        cin >> aa >> b >> c >> d;

        pii tl = {min(aa, c), min(b, d)};
        pii br = {max(aa, c), max(b, d)};

        vector<vector<rect>> next_sols;

        For (j, 4) {
            auto rs = gen_rects(tl, br, j);

            for (const auto& sol : sols) {
                ll total_area = 0;
                vector<rect> non_zero;

                for (auto rx : rs) {
                    for (auto ry : sol) {
                        auto inter_r = intersection(rx, ry);
                        ll a = area(inter_r);
                        if (a == 0) continue;

                        non_zero.push_back(inter_r);
                        total_area += a;
                    }
                }

                if (total_area > 0) next_sols.push_back(non_zero);
            }

            if (i == 0) next_sols.push_back(rs);   
        }

        sols = next_sols;
        // cout << "i = " << i << ", sols.size = " << sols.size() << endl; 
    }

    ll best = 0;
    for (const auto& sol : sols) {
        ll a = 0;
        for (const auto& r : sol) a += area(r);
        
        best = max(best, a);
    }

    cout << best << "\n";
}