N,K = map(int,input().split())
H = list(map(int,input().split()))
XY = [tuple(map(int,input().split())) for _ in range(N)]

order = list(range(N))
order.sort(key=lambda i: H[i])

deleted = [0] * N
for i in range(1,N):
    oi = order[i]
    x,y = XY[oi]
    for j in range(i):
        oj = order[j]
        if deleted[oj]: continue
        if H[oi] == H[oj]: continue
        x2,y2 = XY[oj]
        if (x-x2)**2 + (y-y2)**2 <= K**2:
            deleted[oj] = 1

print(N - sum(deleted))