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

C = [A[i] - B[i] for i in range(n)]
D = [A[i] + B[i] for i in range(n)]

current_run = 1
result = 0

for i in range(1, n):
    if C[i] > C[i-1] and D[i] > D[i-1]:
        current_run += 1
    else:
        result += current_run * (current_run - 1) // 2
        current_run = 1

result += current_run * (current_run - 1) // 2
print(result)