n = int(input())
input()
now = 0
st = {0, n}
for x in map(int, input().split()):
    now += x
    st.add(now)

assert now == n

input()
for x in map(int, input().split()):
    now -= x
    st.add(now)

assert now == 0

ans = n + 1 - len(st)
print(ans)