#ifdef LOCAL
#define _GLIBCXX_DEBUG 1
#define dbg(...) cerr << "LINE(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#else
#define dbg(...) 0
#endif

#if 0
    #include <ext/pb_ds/assoc_container.hpp>
    #include <ext/pb_ds/tree_policy.hpp>
 
    template<class T>
    using ordered_set = __gnu_pbds::tree<T, __gnu_pbds::null_type, std::less<T>, __gnu_pbds::rb_tree_tag,
        __gnu_pbds::tree_order_statistics_node_update>;
#endif

#include <vector> 
#include <list> 
#include <map> 
#include <set> 
#include <queue>
#include <stack> 
#include <bitset> 
#include <algorithm> 
#include <numeric> 
#include <utility> 
#include <sstream> 
#include <iostream> 
#include <iomanip> 
#include <cstdio> 
#include <cmath> 
#include <cstdlib> 
#include <ctime> 
#include <cstring>
#include <random>
#include <chrono>
#include <cassert>

using namespace std;
 
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define sz(x) (int)(x).size()
#define all(x) begin(x), end(x)
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define REP(i,n) for(int (i)=0;(i)<(int)(n);(i)++)

#define each(a,x) for (auto& a: x)
#define tcT template<class T
#define tcTU tcT, class U
#define tcTUU tcT, class ...U
template<class T> using V = vector<T>; 
template<class T, size_t SZ> using AR = array<T,SZ>;

typedef string str;
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;
 
template<typename T, typename U> T &ctmax(T &x, const U &y){ return x = max<T>(x, y); }
template<typename T, typename U> T &ctmin(T &x, const U &y){ return x = min<T>(x, y); }
 
mt19937 rng((unsigned)chrono::steady_clock::now().time_since_epoch().count());
 
#define ts to_string
str ts(char c) { return str(1,c); }
str ts(bool b) { return b ? "true" : "false"; }
str ts(const char* s) { return (str)s; }
str ts(str s) { return s; }
str ts(vector<bool> v) { str res = "{"; F0R(i,sz(v)) res += char('0'+v[i]);	res += "}"; return res; }
template<size_t SZ> str ts(bitset<SZ> b) { str res = ""; F0R(i,SZ) res += char('0'+b[i]); return res; }
template<class A, class B> str ts(pair<A,B> p);
template<class T> str ts(T v) { bool fst = 1; str res = "{"; for (const auto& x: v) {if (!fst) res += ", ";	fst = 0; res += ts(x);}	res += "}"; return res;}
template<class A, class B> str ts(pair<A,B> p) {return "("+ts(p.first)+", "+ts(p.second)+")"; }
 
template<class A> void pr(A x) { cout << ts(x); }
template<class H, class... T> void pr(const H& h, const T&... t) { pr(h); pr(t...); }
void ps() { pr("\n"); }
template<class H, class... T> void ps(const H& h, const T&... t) { pr(h); if (sizeof...(t)) pr(" "); ps(t...); }
 
void DBG() { cerr << "]" << endl; }
template<class H, class... T> void DBG(H h, T... t) {cerr << ts(h); if (sizeof...(t)) cerr << ", ";	DBG(t...); }

tcTU> void re(pair<T,U>& p);
tcT> void re(V<T>& v);
tcT, size_t SZ> void re(AR<T,SZ>& a);

tcT> void re(T& x) { cin >> x; }
void re(double& d) { str t; re(t); d = stod(t); }
void re(long double& d) { str t; re(t); d = stold(t); }
tcTUU> void re(T& t, U&... u) { re(t); re(u...); }

tcTU> void re(pair<T,U>& p) { re(p.first,p.second); }
tcT> void re(V<T>& x) { each(a,x) re(a); }
tcT, size_t SZ> void re(AR<T,SZ>& x) { each(a,x) re(a); }
tcT> void rv(int n, V<T>& x) { x.rsz(n); re(x); }

constexpr bool multitest() {return 0;}
void solve();
int main() {
	ios_base::sync_with_stdio(false); cin.tie(NULL);
	int t = 1;
	if (multitest()) cin >> t;
	for (; t; t--) solve();
}






















int tree[5010][5010];

int get(int ox, int oy) {
	int s = 0;
	for (int x = ox+1; x > 0; x-=x&-x) {
		for (int y = oy+1; y > 0; y-=y&-y) {
			s += tree[x][y];
		}
	}
	return s;
}

int getr(int x1, int x2, int y1, int y2) {
	return get(x2,y2) - get(x1-1,y2) - get(x2,y1-1) + get(x1-1,y1-1);
}

void add(int ox, int oy, int d) {
	for (int x = ox+1; x < 5010; x+=x&-x) {
		for (int y = oy+1; y < 5010; y+=y&-y) {
			tree[x][y] += d;
		}
	}
}

int seen[5010][5010];

void solve() {
	int n, si, sst; re(n,si,sst);

	seen[0][0] = 1;
	add(0, 0, 1);

	int ans = 0;

	for (int i = 0; i < n; i++) {
		int il, ih, tl, th; re(il, ih, tl, th);
		il -= si;
		ih -= si;
		tl -= sst;
		th -= sst;

		il = max(0, min(il, 5009));
		ih = min(ih, 5009);
		tl = max(0, min(tl, 5009));
		th = min(th, 5009);
		
		if (il > ih || tl > th) continue;

		while (getr(il,ih,tl,th)) {
			int stx = il, edx = ih;
			while (stx < edx) {
				int md = (stx+edx)/2;

				if (!getr(il, md, tl, th)) stx=md+1;
				else edx=md;
			}

			int sty = tl, edy = th;
			while (sty < edy) {
				int md = (sty+edy)/2;

				if (!getr(stx, stx, tl, md)) sty=md+1;
				else edy=md;
			}

			ans = max(ans, stx+sty+1);
			add(stx,sty,-1);

			if (!seen[stx+1][sty]) {
				seen[stx+1][sty] = 1;
				add(stx+1,sty,1);
			}
			if (!seen[stx][sty+1]) {
				seen[stx][sty+1] = 1;
				add(stx,sty+1,1);
			}
		}
	}

	ps(ans);
}