"""

"""

import sys
from sys import stdin

N = int(input())
_ = input()
A = list(map(int,stdin.readline().split()))
_ = input()
B = list(map(int,stdin.readline().split()))

lis = [False] * (N+1)
lis[0] = lis[N] = True

s = 0
for na in A:
    s += na
    lis[s] = True

s = N
for nb in B:
    s -= nb
    lis[s] = True

ans = 0
for i in lis:
    if not i:
        ans += 1

print (ans)