#include <bits/stdc++.h>
#define FOR(i, n) for(int i = 0; i < (n); ++i)
#define REP(i, a, b) for(int i = (a); i < (b); ++i)
#define TRAV(i, a) for(auto &i : (a))
#define X first
#define Y second
#define MP std::make_pair
#define PR std::pair
#define SZ(x) ((int)(x).size())
typedef long long ll;
typedef std::pair<int, int> PII;
typedef std::vector<int> VI;

typedef long double K;

struct vec2{
	K x, y;
	vec2() {}
	vec2(K x, K y) : x(x), y(y) {}
	vec2 operator -(){ return vec2(-this->x, -this->y);}
};

std::ostream & operator << (std::ostream &out, vec2 a){
	out << "(" << a.x << ", " << a.y << ")";
	return out;
}

K dot(vec2 a, vec2 b){
	return a.x*b.x + a.y*b.y;
}
K len(vec2 a){ return std::sqrt(dot(a, a));}
K angle(vec2 a, vec2 b){
	return std::acos(std::max((K)-1, std::min((K)1, dot(a, b)*(1/(len(a)*len(b))))));
}

vec2 rot(vec2 a, K ang){
	vec2 my;
	my.x = a.x*std::cos(ang)-a.y*std::sin(ang);
	my.y = a.x*std::sin(ang)+a.y*std::cos(ang);
	return my;
}

int main(){
	std::ios_base::sync_with_stdio(false);
	std::cin.tie(0);
	int n, r, a, b;
	std::cin >> n >> r >> a >> b;
	vec2 vec = vec2(a, b);
	vec2 zer = vec2(1, 0);
	K an = angle(vec, zer);
	if(vec.y > 0){
		an = -an;
	}
	std::vector<PR<K, int> > ev;
	FOR(i, n){
		int x, y;
		std::cin >> x >>y;
		vec2 xd = rot(vec2(x, y), an);
		K h2 = xd.y*xd.y;
		K r2 = 1ll*r*r;
		if(r2 < h2) continue;
		K d = std::sqrt(r2-h2);
		ev.push_back(MP(xd.x-d-0.000000001, 1));
		ev.push_back(MP(xd.x+d+0.000000001, -1));
	}
	std::sort(ev.begin(), ev.end());
	int max = 0;
	int cur = 0;
	TRAV(i, ev){
		cur += i.Y;
		max = std::max(max, cur);
	}
	std::cout << max;
	return 0;
}