N,K=(int(x) for x in input().split())
H=list(map(int, input().split()))
zahyou=[]
for i in range(N):
    x,y=(int(x) for x in input().split())
    zahyou.append([x,y])

mem=[]
for i, j in zip(H, zahyou):
    mem.append([i,j[0],j[1]])

mem=sorted(mem, key=lambda x: x[0])[::-1]
leave=[True]*N
for i in range(N-1,-1,-1):
    for j in range(i+1,N):
        if leave[j] == True and mem[i][0] > mem[j][0] and ((mem[i][1] - mem[j][1])**2 + (mem[i][2] - mem[j][2])**2)**(1/2) <= K:
            leave[j] = False

ans=0
for i in leave:
    if i == True:
        ans += 1

print(ans)