N,K = list(map(int,input().split()))
H = list(map(int,input().split()))
a = []
for i in range(N):
    x,y = list(map(int,input().split()))
    a.append((x,y,i))
a.sort(key=lambda x:H[x[2]])

ans = set()
for x,y,idx in a:
    flag = True
    remove_memo = []
    for xx,yy,idx2 in ans:
        if((x-xx)*(x-xx) + (y-yy)*(y-yy) <= K*K and H[idx] > H[idx2]):
            remove_memo.append((xx,yy,idx2))
    for xx,yy,idx2 in remove_memo:
        ans.remove((xx,yy,idx2))
    ans.add((x,y,idx))

print(len(ans))