#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define all(x) (x).begin(), (x).end()
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rrep(i, n) for(int i = (int)(n - 1); i >= 0; i--)
template <typename T> bool chmax(T &a,const T &b){if(a<b){a=b;return true;}return false;}
template <typename T> bool chmin(T &a,const T &b){if(a>b){a=b;return true;}return false;}
using ll = long long;
#define int ll
using vi = vector<int>;
using vvi = vector<vector<int>>;
using vb = vector<bool>;
using vvb = vector<vector<bool>>;
using vs = vector<string>;
using pii = pair<int, int>;
// using mint = modint!!!number!!!;



signed main(){
  int n, k; cin >> n >> k;
  k *= k;
  vvi hxy(n, vi(3));
  rep(i, n) cin >> hxy.at(i).at(0);
  rep(i, n) cin >> hxy.at(i).at(1) >> hxy.at(i).at(2);
  sort(all(hxy));
  int ans = n;
  rep(i, n){
  	for(int j = i + 1; j < n; j++){
  		int x1 = hxy.at(i).at(1), y1 = hxy.at(i).at(2), x2 = hxy.at(j).at(1), y2 = hxy.at(j).at(2);
  		if((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2) <= k && hxy.at(i).at(0) < hxy.at(j).at(0)){
  			ans--;
  			break;
  		}
  	}
  }
  cout << ans << endl;
}