N = int(input())
A = list(map(int,input().split()))
B = list(map(int,input().split()))

def calc(i,j):
    if B[i] < B[j]:
        return A[i] + B[j] < A[j] + B[i]
    else:
        return A[i] + B[i] < A[j] + B[j]
ans = 0
left = 0
while left < N-1:
    right = left + 1
    while right < N and calc(right - 1,right):
        right += 1
    if right == left + 1:
        left += 1
        continue
    else:
        delta = right - left
        ans += delta * (delta - 1) // 2
        left = right
print(ans)