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//~ while (clock()<=69*CLOCKS_PER_SEC)
//~ #pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("O3")
//~ #pragma GCC optimize("Ofast")
//~ #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
//~ #pragma GCC optimize("unroll-loops")

#include <bits/stdc++.h>

using namespace std;

using ll=long long;
using ld=long double;
using pii=pair<int, int>;
using pll=pair<ll, ll>;
using vi=vector<int>;
using vll=vector<ll>;

template<class TH> void _dbg(const char *sdbg, TH h){ cerr<<sdbg<<" = "<<h<<endl; }
#ifdef LOCAL
#define _upgrade ios_base::sync_with_stdio(0);
#define debug(...) _dbg(#__VA_ARGS__, __VA_ARGS__);
#else
#define _upgrade ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
#define debug(...) 98;
#define cerr if(0) cout
#endif

#define pb push_back
#define mp make_pair
#define all(x) x.begin(),x.end()
#define sz(x) ((int)(x).size())
#define fi first
#define se second

#define erase_duplicates(x) sort(all(x)), (x).resize(distance((x).begin(), unique(all(x))));

#define watch(x) cout << (#x) << " is " << (x) << endl;

#define pow2(x) ((x)*(x))
#define mod(x, m) ((((x) % (m)) + (m)) % (m))
#define max3(a, b, c) max(a, max(b, c))
#define min3(a, b, c) min(a, min(b, c))

#define REP(i, a, b) for(int i = a; i <= b; ++i)
#define REPV(i, b, a) for(int i = b; i >= a; --i)

const double m_pi = acos(-1.0);
const int int_max = 0x3f3f3f3f;
const int M7 = 1000*1000*1000+7;
const int M9 = 1000*1000*1000+9;

int n, x, y;

vector<pii> prost;
vector<ll> pola;
vector<pii> prosty;
vector<ll> polay;
vector<pii> prostx;
vector<ll> polax;
vector<int> stref;
int alive[1000009];
int otw[1000009];
int occ[1000009];

const int mmm = -100000000;

void licz(){//cerr<<endl;
    for(int i=0;i<2*n+5;++i){
        alive[i]=0;
        otw[i]=-1;
        occ[i]=0;
    }
    stref.clear();
    int ooo=0;
    for(int i=0;i<sz(prost)-1;++i){//debug(prost[i].second);
        int rozm = prost[i+1].first - prost[i].first;
        if(prost[i].second > 0){
            stref.pb(i);
            alive[prost[i].second]=1;
            ++ooo;
        }
        else if(prost[i].second < 0 && prost[i].second!=mmm){
            alive[-prost[i].second]=0;
            --ooo;
            while(sz(stref)>0){
                if(alive[prost[stref[sz(stref)-1]].second]==0)stref.pop_back();
                else break;
            }//cerr<<"otw: "<<otw[ooo]<<endl;
            //if(sz(stref))debug(stref[sz(stref)-1])
            if(otw[ooo]!=-1)
            if(sz(stref) == 0 || otw[ooo] >= stref[sz(stref)-1]){
                rozm+= pola[otw[ooo]];
            }
        }
        occ[i]=ooo;
        otw[ooo]=i;//debug(rozm);
        pola.pb(rozm);
    }
}

int main(){
    _upgrade
    cout<<fixed<<setprecision(15);

    cin>>n>>x>>y;

    for(int i=1;i<=n;++i){
        int x1, y1, x2, y2;
        cin>>x1>>y1>>x2>>y2;
        if(x1>x2)swap(x1, x2);
        if(y1>y2)swap(y1, y2);
        prosty.push_back({x1, i});
        prosty.push_back({x2, -i});
        prostx.push_back({y1, i});
        prostx.push_back({y2, -i});
    }
    prosty.pb({0, mmm});
    prosty.pb({x, 0});
    prostx.pb({0, mmm});
    prostx.pb({y, 0});

    sort(all(prosty));
    sort(all(prostx));

    swap(prost, prosty);
    swap(pola, polay);
    licz();
    swap(prost, prosty);
    swap(pola, polay);

    swap(prost, prostx);
    swap(pola, polax);
    licz();
    swap(prost, prostx);
    swap(pola, polax);

    long long m1=-1;
    for(int i=0;i<sz(polay);++i){
        m1=max(m1, polay[i]);
    }

    long long m2=-1;
    for(int i=0;i<sz(polax);++i){
        m2=max(m2, polax[i]);
    }

    cout<<m1*m2<<endl;


    return 0;
}




/*
    __builtin_popcount count total set bits on a given integer
    (use __builtin_popcountll for long long).


*/