N = int(input())
A = list(map(int, input().split())) + [0]
B = list(map(int, input().split())) + [0]
ans = 0
flag = 1
for i in range(N + 1):
    if flag == 1:
        nowa = A[i] + B[i]
        nowb = A[i] - B[i]
        flag = 0
        cnt = 1
    else:
        nexta = A[i] + B[i]
        nextb = A[i] - B[i]
        if nowa < nexta and nowb < nextb:
            cnt += 1
            nowa = nexta
            nowb = nextb
        else:
            flag = 1
            ans += (cnt - 1) * cnt // 2
print(ans)