n = int(input())
_ = int(input())
a = list(map(int, input().split()))
_ = int(input())
b = list(map(int, input().split()))

d = [True for _ in range(n+1)]
now = 0
for x in a:
    now += x
    d[now] = False
for x in b:
    now -= x
    d[now] = False

print(d.count(True))