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#include <iostream>
#include <sstream>
#include <fstream>
#include <string>
#include <vector>
#include <queue>
#include <algorithm>
#include <map>
#include <set>
#include <bitset>

using namespace std;

typedef unsigned long long LL;

#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define ABS(val) ((val) < 0 ? -(val) : (val))

#define FOR(x, b, e) for(int x = b; x <= (e); ++x)
#define FORD(x, b, e) for(int x = b; x >= (e); --x)
#define REP(x, n) for(int x = 0; x < (n); ++x)
#define VAR(v, n) __typeof(n) v = (n)
#define ALL(c) (c).begin(), (c).end()
#define SIZE(x) ((int)(x).size())
#define FOREACH(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define PB push_back
#define ST first
#define ND second

#define M 1000000007ULL

/* PA2019 "TER" */
  
struct p {
  int x;
  int y;
  
  int nr;
  bool is_end;
  
  bool is_endy;
};



bool cmp_x(const struct p &p1, const struct p &p2) 
{ 
    return (p1.x < p2.x); 
} 

bool cmp_y(const struct p &p1, const struct p &p2) 
{ 
    return (p1.y < p2.y); 
} 

int seg [500100]  = {};
int segy [500100]  = {};

int main() {

	int n, X, Y;
	scanf("%d %d %d\n", &n ,&X, &Y);
	
	vector<p> pts;
	
    REP(i, n) {
		int x1, y1, x2, y2;
		scanf("%d %d %d %d", &x1, &y1, &x2, &y2);
		
		p p1;
		p1.x = x1;
		p1.y = y1;
		p1.nr = i;
		
		
		p p2;
		p2.x = x2;
		p2.y = y2;		
		p2.nr = i;
		
		if (x1 < x2)
		{
			p1.is_end = false;
			p2.is_end = true;
		}
		else 
		{
			p1.is_end = true;
			p2.is_end = false;
			
		}
		
		if (y1 < y2)
		{
			p1.is_endy = false;
			p2.is_endy = true;
		}
		else 
		{
			p1.is_endy = true;
			p2.is_endy = false;
			
		}
		
		pts.PB(p1);
		pts.PB(p2);
	}
	
	
	sort(ALL(pts), cmp_x);
	
	/*
	REP(i, 2 * n){
		printf("nr %d, is end %d, x %d, y %d\n", pts[i].nr, pts[i].is_end, pts[i].x, pts[i].y); 
	}
	*/
	
	int last_x = 0;
	vector <int> codes;
	codes.PB(-1);
	
	VAR(p, pts.begin());
	
	
	while (p != pts.end()) {
		int x = p->x;
		
		seg[codes.back() + 1] += x - last_x;
		/*
		REP(i, 5)
		  printf("S %d\n", seg[i]);
		  */
		
		while (p != pts.end() && p->x == x) {
			//printf("px %d, nr %d\n", p->x, p->nr);
					
			if (p->is_end) {
				//rem nr
				codes.erase(std::remove(ALL(codes), p->nr), codes.end());
			}
			else {
				codes.PB(p->nr);
			}	
			p++;		
		}
		
		last_x = x;
	
/*	
		FOREACH(v, codes)
			printf("%d, last_x %d\n", *v, last_x); 
			*/

	}
	
	
	//assert(codes.size() == 1);
	//REP(i, 5)
	//	  printf("S %d\n", seg[i]);
	
	seg[0] += (X - last_x);
	
	//REP(i, 5)
	//	  printf("S %d\n", seg[i]);
	
	int x_max = -1;
	REP (i, n + 5) {
		x_max = MAX(x_max, seg[i]);
		
	}
	
	
	////////////////////
	
	sort(ALL(pts), cmp_y);
	
	/*
	REP(i, 2 * n){
		printf("nr %d, is end %d, x %d, y %d\n", pts[i].nr, pts[i].is_end, pts[i].x, pts[i].y); 
	}
	*/
	
	int last_y = 0;
	vector <int> codesy;
	codesy.PB(-1);
	
	p = pts.begin();
	
	
	while (p != pts.end()) {
		int y = p->y;
		
		segy[codesy.back() + 1] += y - last_y;
		/*
		REP(i, 5)
		  printf("S %d\n", seg[i]);
		  */
		
		while (p != pts.end() && p->y == y) {
			//printf("px %d, nr %d\n", p->x, p->nr);
					
			if (p->is_endy) {
				//rem nr
				codesy.erase(std::remove(ALL(codesy), p->nr), codesy.end());
			}
			else {
				codesy.PB(p->nr);
			}	
			p++;		
		}
		
		last_y = y;
	
/*	
		FOREACH(v, codes)
			printf("%d, last_x %d\n", *v, last_x); 
			*/

	}
	
	
	//assert(codes.size() == 1);
	//REP(i, 5)
	//	  printf("S %d\n", seg[i]);
	
	segy[0] += (Y - last_y);
	
	//REP(i, 5)
	//	  printf("S %d\n", seg[i]);
	
	int y_max = -1;
	REP (i, n + 5) {
		y_max = MAX(y_max, segy[i]);
		
	}
	
	
	
	
	
	
	
	
	LL xmax = x_max;
	LL ymax = y_max;
	printf("%lld\n", xmax * ymax);

	


	return 0;
}