#ifndef LOCAL
#pragma GCC optimize("O3")
#endif
#include <bits/stdc++.h>
using namespace std;

#define sim template < class c
#define ris return * this
#define mor > muu & operator << (
#define R22(r) sim > typename \
  enable_if<1 r sizeof dud<c>(0), muu&>::type operator<<( c g) {
sim > struct rge { c b, e; };
sim > rge<c> range(c h, c n) { return {h, n}; }
sim > auto dud(c * r) -> decltype(cerr << *r);
sim > char dud(...);
struct muu {
	#ifdef LOCAL
	stringstream a;
	~muu() { cerr << a.str() << endl; }
	R22(<) a << boolalpha << g; ris; }
	R22(==) ris << range(begin(g), end(g)); }
	sim, class b mor pair < b, c> r) { ris << "(" << r.first << ", " << r.second << ")"; }
	sim mor rge<c> u) {
		a << "[";
		for (c i = u.b; i != u.e; ++i) 
			*this << ", " + 2 * (i == u.b) << *i;
		ris << "]";
	}
#else
sim mor const c&) { ris; }
#endif
muu & operator()() { ris; }
};
#define imie(r...) "[" #r ": " << (r) << "] "
#define debug (muu() << __FUNCTION__ << "#" << __LINE__ << ": ")

using ld = long double;
using pld = pair<ld, ld>;

ld dot(pld a, pld b) {
	return a.first * b.first + a.second * b.second;
}

ld cross(pld a, pld b) {
	return a.first * b.second - a.second * b.first;
}

pld czytaj() {
	ld a, b;
	cin >> a >> b;
	return {a, b};
}

int n;
ld R;
pld v;

const ld eps = 1e-7;

int main() {
	ios_base::sync_with_stdio(0);
	cin >> n >> R;
	v = czytaj();
	ld dlu = sqrtl(dot(v, v));
	v.first /= dlu;
	v.second /= dlu;
	
	vector<pair<ld, int>> tab;
	
	for (int i = 1; i <= n; ++i) {
		pld t = czytaj();
		
		ld x = dot(t, v);
		ld h = cross(t, v);
		
		ld lul = R * R - h * h;
		if (lul > 0) {
			lul = sqrtl(lul);
			tab.push_back({x - lul - eps, 1});
			tab.push_back({x + lul + eps, -1});
		}
		else if (lul > -eps) {
			
			tab.push_back({x - eps, 1});
			tab.push_back({x + eps, -1});
		}
	}
	
	sort (tab.begin(), tab.end());
	
	int res = 0;
	int bil = 0;
	for (auto &u : tab) {
		bil += u.second;
		res = max(res, bil);
	}
	cout << res << endl;
}