#include<bits/stdc++.h>
using namespace std;

int main(){
	ios::sync_with_stdio (false);
	cin.tie(0);
	int n;
	int aa, bb,rr;
	long double a, b, r;
	vector<pair<long double, int> > inter;
	
	long double x[n], y[n];
	cin >> n >> rr >> aa >> bb;
	a = aa;
	b = bb;
	r = rr;
	r += 5 * 1e-4;
	
	for(int i = 0; i < n; i++){
		int k, l;
		cin >> k >> l;
		x[i] = k;
		y[i] = l;
		if(abs(a) < abs(b)) swap(x[i], y[i]);
	}
	if(abs(a) < abs(b)) swap(a, b);
	
	
	if (a > 0) a += 1e-6;
	els a -= 1e-6;
	
	for(int i = 0; i<n; i++){
		
		long double k = (1.0 + (b / a) * (b / a));
		long double l = ((-2.0 * x[i] - 2.0 * y[i] * b) / a);
		long double m = x[i] * x[i] + y[i] * y[i] - r * r;
		if(l * l - 4.0 * k * m <= 1e-6) continue;
		k += 1e-6;
		long double x0 = (-l + sqrt(l * l - 4.0 * k * m)) / (2.0 * k);
		long double x1 = (-l - sqrt(l * l - 4.0 * k * m)) / (2.0 * k);
		
		inter.push_back({x1, 1});
		inter.push_back({x0, -1});
	}
	//cout << inter.size() << endl;
	sort(inter.begin(), inter.end());
	int cur = 0;
	int ans = 0;
	for(auto x: inter){
		//cout << x.first << " " << x.second << endl;
		cur += x.second;
		ans = max(ans, cur);
	}
	
	cout << ans << endl;
}