#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using Vi = vector<int>;
using Pii = pair<int,int>;
#define mp make_pair
#define pb push_back
#define x first
#define y second
#define rep(i,b,e) for(int i = (b); i < (e); i++)
#define each(a, x) for(auto& a : (x))
#define all(x) (x).begin(),(x).end()
#define sz(x) int((x).size())

using dbl = double;
using vec2 = pair<dbl, dbl>;
constexpr dbl EPS = 1e-7;

vec2 rot(vec2 p, dbl a) {
	return {p.x*cos(a) - p.y*sin(a), p.x*sin(a) + p.y*cos(a)};
}

int main() {
	cin.sync_with_stdio(0); cin.tie(0);
	cout << fixed << setprecision(12);

	int n;
	dbl r, a, b;
	cin >> n >> r >> a >> b;

	vector<vec2> points(n);
	each(p, points) cin >> p.x >> p.y;

	dbl ang = atan2(b, a);
	each(p, points) p = rot(p, -ang);

	vector<pair<dbl, int>> events;

	each(p, points) {
		dbl kek = r*r - p.y*p.y;
		if (kek < 0) continue;

		dbl d = sqrt(kek);
		events.pb({p.x-d-EPS, 1});
		events.pb({p.x+d+EPS, -1});
	}

	int ans = 0, cur = 0;
	sort(all(events));

	each(e, events) {
		cur += e.y;
		ans = max(ans, cur);
	}

	cout << ans << endl;
	return 0;
}