import sys


def input():
    return sys.stdin.readline().strip()


def main():
    n, k = map(int, input().split())

    (*h,) = map(int, input().split())
    xy = [tuple(map(int, input().split())) for _ in range(n)]

    z = sorted(range(n), key=lambda x: h[x], reverse=True)
    xy = [xy[i] for i in z]
    h = sorted(h, reverse=True)

    a = n
    for i in range(n):
        for j in range(i):
            if (xy[i][0] - xy[j][0]) ** 2 + (xy[i][1] - xy[j][1]) ** 2 <= k * k and h[j] > h[i]:
                a -= 1
                break
    print(a)


if __name__ == "__main__":
    main()