N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
A.sort()
cnt = 0
for i in range(N):
    if B[i] < A[i]:
        cnt += N - i
    elif B[i] >= A[-1]:
        cnt += 0
    else:
        l, r = i, N
        d = (l + r) // 2
        for j in range(len(bin(N))):
            if A[d] <= B[i]:
                l = d
                d = (l + r) // 2
            else:
                r = d
                d = (l + r) // 2
        cnt += N - d - 1
print(cnt)