n, k = map(int, input().split())
h = list(map(int, input().split()))
xy = [tuple(map(int, input().split())) for _ in range(n)]
k *= k
h = [(h[i], i) for i in range(n)]
h.sort(key=lambda x: x[0])

remain = set()
wait = set()
now = 0
for i in range(n):
    xi, yi = xy[h[i][1]]
    if h[i][0] > now:
        remain |= wait
        wait.clear()
        now = h[i][0]
    wait.add(h[i][1])
    tmp = set()
    for j in list(remain):
        xj, yj = xy[j]
        if (xi - xj)**2 + (yi - yj)**2 <= k:
            pass
        else:
            tmp.add(j)
    remain = tmp

remain |= wait
print(len(remain))