---

```
n = int(input())
a = list(map(int, input().split()))
b = list(map(int, input().split())) if n > 1 else []

total = sum(a)
k = sum(b) // total + 1
missing = k * total - sum(b)

current = sum(a[:k])
answer = 0

for i in range(n):
    if current == missing:
        answer += 1

    current += a[(i + k) % n] - a[i]

print(answer)
```