#include <bits/stdc++.h>
//#include<atcoder/all>
using namespace std;
//using namespace atcoder;
using ll = long long;
const ll mod = 1000000007;
//const ll mod = 998244353;
int dx[4] = { 0,1,0,-1 }, dy[4] = { -1,0,1,0 };
ll n,k, h[2009], x[2009], y[2009];
vector < tuple <ll, ll, ll>>T;
int main() {
	cin >> n >> k;
	for (int i = 1; i <= n; i++)cin >> h[i];
	for (int i = 1; i <= n; i++) {
		cin >> x[i] >> y[i];
		T.emplace_back(h[i], x[i], y[i]);
	}
	sort(T.begin(), T.end());
	ll ans = n;
	for (int i = 0; i < n; i++) {
		bool ok = false;
		for (int j = i + 1; j < n; j++) {
			if (get<0>(T[i]) >=get<0>(T[j]))continue;
			ll len = (get<1>(T[j]) - get<1>(T[i])) * (get<1>(T[j]) - get<1>(T[i])) + (get<2>(T[j]) - get<2>(T[i])) * (get<2>(T[j]) - get<2>(T[i]));
			if (len <= k * k)ok = true;
		}
		if (ok)ans--;
	}
	cout << ans << endl;
}