n = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
C = [a - b for a, b in zip(A, B)]
C.append(-1 << 30)
ans = 0
r = 0
for l in range(n):
    if l == r:
        r += 1
    while C[l] < C[r]:
        r += 1
    ans += r - l - 1
print(ans)