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#include <bits/stdc++.h>

using namespace std;

typedef unsigned uint;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ldbl;
typedef pair<int, int> pii;
typedef pair<uint, uint> puu;
typedef pair<ll, ll> pll;
typedef pair<ull, ull> pull;
typedef pair<double, double> pdd;
typedef vector<int> vi;
typedef vector<uint> vu;
typedef vector<ll> vll;
typedef vector<ull> vull;
typedef vector<pii> vpii;
typedef vector<puu> vpuu;
typedef vector<pll> vpll;
typedef vector<pull> vpull;
typedef vector<string> vstr;
typedef vector<double> vdbl;
typedef vector<ldbl> vldbl;
#define pb push_back
#define ppb pop_back
#define pfr push_front
#define ppfr pop_front
#define emp emplace
#define empb emplace_back
#define be begin
#define rbe rbegin
#define all(x) (x).be(), (x).end()
#define rall(x) (x).rbe(), (x).rend()
#define fir first
#define sec second
#define mkp make_pair
#define brif(cond) if (cond) break
#define ctif(cond) if (cond) continue
#define retif(cond) if (cond) return
void canhazfast() {ios_base::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);}
template<typename T> T gcd(T a, T b) {return b ? gcd(b, a%b) : a;}
template<typename T> T extgcd(T a, T b, T &x, T &y)
{
    T x0 = 1, y0 = 0, x1 = 0, y1 = 1;
    while (b) {
        T q = a/b; a %= b; swap(a, b);
        x0 -= q*x1; swap(x0, x1);
        y0 -= q*y1; swap(y0, y1);
    }
    x = x0; y = y0; return a;
}
int ctz(uint x) {return __builtin_ctz(x);}
int ctzll(ull x) {return __builtin_ctzll(x);}
int clz(uint x) {return __builtin_clz(x);}
int clzll(ull x) {return __builtin_clzll(x);}
int popcnt(uint x) {return __builtin_popcount(x);}
int popcntll(ull x) {return __builtin_popcountll(x);}
int bsr(uint x) {return 31^clz(x);}
int bsrll(ull x) {return 63^clzll(x);}

//#define MOD 1000000007 /// A = 5, ...
//#define MOD 998244353 /// A = 3, ...
//#define MOD 1999999973 /// A = 2, ...
#define MOD 2000000011 /// A = 2, ...
//#define MOD 2147483647 /// A = 7, ...

uint add(uint a, uint b) { return a+b < MOD ? a+b : a+b-MOD; }
uint sub(uint a, uint b) { return a < b ? a+MOD-b : a-b; }
uint mul(uint a, uint b) { return (ull)a*b%MOD; }
uint sqr(uint a) { return mul(a, a); }

uint modpow(uint b, uint e)
{
    uint r = 1;
    for (; e; e >>= 1) {
        if (e&1) r = mul(r, b);
        b = sqr(b);
    }
    return r;
}

uint modinv(uint n) { return modpow(n, MOD-2); }
uint moddiv(uint n, uint d) { return mul(n, modinv(d)); }

#define N 500016

uint a[N];
pii ev[2*N];
pii px[N], py[N];
map<uint, int> sum[N];

int solve(int n, int m, pii p[])
{
    int res = 0, cnt = 0, k = 0;
    uint check = 0;

    sort(p, p+n);
    n = unique(p, p+n)-p;
    for (int i = 0; i <= n; ++i) sum[i].clear();
    for (int i = 0; i < n; ++i) {
        int id = i+1;
        ev[k++] = {p[i].fir, +id};
        ev[k++] = {p[i].sec, -id};
    }
    sort(ev, ev+k);
    ev[k] = {m, 0};
    sum[0][check] += ev[0].fir; /// !!!
    for (int i = 0, j = 0; i < k; i = j) {
        while (j < k && ev[j].fir == ev[i].fir) {
            int id = ev[j].sec;
            if (id > 0) {
                ++cnt;
                check = add(check, a[id-1]);
            } else {
                --cnt;
                check = sub(check, a[-id-1]);
            }
            ++j;
        }
        int len = ev[j].fir-ev[i].fir;
        sum[cnt][check] += len;
    }
    for (int i = 0; i <= n; ++i) {
        for (const auto &e : sum[i]) res = max(res, e.sec);
    }
    return res;
}

int main()
{
    canhazfast();

    int n, w, h;
    int ansx, ansy;
    ll ans;
    constexpr uint A = 2; /// ?

    cin >> n >> w >> h;
    for (int i = 0; i < n; ++i) {
        cin >> px[i].fir >> py[i].fir >> px[i].sec >> py[i].sec;
        if (px[i].fir > px[i].sec) swap(px[i].fir, px[i].sec);
        if (py[i].fir > py[i].sec) swap(py[i].fir, py[i].sec);
    }

    a[0] = 1;
    for (int i = 1; i < n; ++i) a[i] = mul(a[i-1], A);

    ansx = solve(n, w, px);
    ansy = solve(n, h, py);
    //cerr << "ansx = " << ansx << '\n';
    //cerr << "ansy = " << ansy << '\n';
    ans = (ll)ansx*ansy;
    cout << ans << '\n';

    return 0;
}