import sys


def debug(*args):
    print(*args, file=sys.stderr)


n, k = map(int, input().split())
h = list(map(int, input().split()))

xy = [list(map(int, input().split())) for _ in range(n)]
hxy = [[h[i], xy[i][0], xy[i][1]] for i in range(n)]
hxy.sort()

ans = n

for i in range(n-1):
    hi, xi, yi = hxy[i]
    for j in range(i+1, n):
        hj, xj, yj = hxy[j]
        if hi == hj:
            continue
        if (xi-xj)**2 + (yi-yj)**2 <= k**2:
            ans -= 1
            break

print(ans)