def dist(x1,y1,x2,y2):
    return ((x1-x2)**2+(y1-y2)**2)**(1/2)

N,K = map(int, input().split())
H = list(map(int, input().split()))
S = list()
for i in range(N):
    x,y = map(int, input().split())
    S.append((H[i],x,y))
S.sort()
#print(S)
done = [False for _ in range(N)]
for i in range(N):
    for j in range(N-1, -1, -1):
        if j<=i:
            continue
        if not done[i] and not done[j]:
            hi,xi,yi = S[i]
            hj,xj,yj = S[j]
            if hi==hj:
                continue
            k = dist(xi,yi,xj,yj)
            if k<=K:
                done[i] = True
    #print(done)
#print(done)
print(N-sum(done))