typedef long long ll;
typedef long double ld;

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

signed main() {
    ll n,k;
    std::cin >> n>>k;
    vector<ll> h(n);
    for (int i = 0; i < n; i++) {
        std::cin >> h[i];
    }
    vector<ll> x(n),y(n);
    for (int i = 0; i < n; i++) {
        std::cin >> x[i]>>y[i];
    }
    vector<tuple<ll,ll,ll>> hxy(n);
    for (int i = 0; i < n; i++) {
        hxy[i] = {h[i], x[i], y[i]};
    }
    sort(hxy.begin(),hxy.end());
    ll ans = n;
    for (int i = 0; i < n; i++) {
        auto [hi,xi,yi] = hxy[i];
        for (int j = i+1; j < n; j++) {
            auto [hj,xj,yj] = hxy[j];
            if(hi<hj&&(xi-xj)*(xi-xj)+(yi-yj)*(yi-yj)<=k*k){
                ans--;
                break;
            }
        }
    }
    std::cout << ans << std::endl;
};