N,K = map(int,input().split())
H = list(map(int,input().split()))
XY = [list(map(int, input().split())) for _ in range(N)]
HXY = []
for h,(x,y) in zip(H,XY):
    HXY.append([h,x,y])
HXY = sorted(HXY, key=lambda x: x[0])
ans = N
for i in range(N):
    th,tx,ty = HXY[i]
    for j in range(i+1,N):
        h,x,y = HXY[j]
        if th<h and (tx-x)**2+(ty-y)**2<=K**2:
            ans-=1
            break
print(ans)