N, K = map(int, input().split())
H = list(map(int, input().split()))
dis = []
for i in range(N):
  x, y = map(int, input().split())
  dis.append((x, y))

H2 = sorted([(H[i], i) for i in range(N)])
ans = [True] * N
for i, j in H2:
  for k in range(N):
    if k != j and H[k] != H[j] and (dis[k][0] - dis[j][0]) ** 2 + (dis[k][1] - dis[j][1]) ** 2 <= K * K and ans[k]:
      ans[j] = False
      break

print(ans.count(True))