from sys import stdin


def main():
    n, k = map(int, stdin.readline().split())
    h = list(map(int, stdin.readline().split()))
    x = [0] * n
    y = [0] * n
    for i in range(n):
        x[i], y[i] = map(int, stdin.readline().split())

    data = [(h[i], x[i], y[i]) for i in range(n)]

    def dist2(i, j):
        ix = data[i][1]
        iy = data[i][2]
        jx = data[j][1]
        jy = data[j][2]
        return (ix-jx) ** 2 + (iy-jy) ** 2

    data.sort(key=lambda x: x[0], reverse=True)
    shrines = [True] * n
    for i in reversed(range(n-1)):
        for j in range(i+1, n):
            if not (shrines[j]):
                continue
            if dist2(i, j) <= k * k:
                if data[i][0] == data[j][0]:
                    continue
                shrines[j] = False

    ans = 0
    for i in range(n):
        if shrines[i]:
            ans += 1

    print(ans)
    return


if __name__ == "__main__":
    main()