def Gauss(n):
    return n * (n + 1)//2

N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
ans, cnt = 0, 0
for i in range(N - 1):
    if A[i + 1] - A[i] > B[i + 1] - B[i]:
        cnt += 1
    else:
        ans += Gauss(cnt)
        cnt = 0
ans += Gauss(cnt)
print(ans)