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

template<class T> istream& operator >> (istream& is, vector<T>& vec) {
    for(T& x : vec) is >> x;
    return is;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    ll n, k;
    cin >> n >> k;
    vector<ll> h(n);
    vector<pair<ll,ll>> a(n);
    cin >> h;
    for(auto &&[x, y] : a){
        cin >> x >> y;
    }
    auto f = [&](int i, int j){
        auto [x1, y1] = a[i];
        auto [x2, y2] = a[j];
        ll dx = x1 - x2, dy = y1 - y2;
        return dx * dx + dy * dy <= k * k;
    };
    vector<bool> used(n);
    for(int i = 0; i < n; i++){
        for(int j = i + 1; j < n; j++){
            if(!f(i, j)) continue;
            if(h[i] > h[j]) used[j] = true;
            else if(h[i] < h[j]) used[i] = true;
        }
    }
    cout << n - count(used.begin(), used.end(), true) << '\n';
}