N = int(input())
A = [int(i)for i in input().split()]
B = [int(i)for i in input().split()]
D = [int(i)for i in input().split()]
D.sort(reverse=True)
A.append(0)
B.append(0)
nowa = A.pop(0)
nowb = B.pop(0)
ans = 0
def kousin():
    global nowa,nowb,A,B
    if nowa -A[0] < nowb -B[0]:
        nowa = A.pop(0)
    else:
        nowb = B.pop(0)
    return False


kousin()
for i in D:
    if i <= nowa +nowb:
        ans += 1
        kousin()


print(ans)