n = int(input())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
d = list(map(int, input().split()))
d = sorted(d, reverse = True)

ia = 0
ib = 0
i = 0
ans = 0
for _ in range(n):
    diff_a = a[ia] - a[ia + 1]
    diff_b = b[ib] - b[ib + 1]
    if diff_a < diff_b:
        ia += 1
    else:
        ib += 1
    sum_ = a[ia] + b[ib]
    while i < n:
        if d[i] <= sum_:
            ans += 1
            i += 1
            break
        else:
            i += 1
print(ans)