n = int(input())
m1 = int(input())
A = list(map(int, input().split()))
m2 = int(input())
B = list(map(int, input().split()))

DP = [1 for _ in range(n + 1)]
res = 0
for i in range(m1):
    res += A[i]
    DP[res] = 0
res = n
for i in range(m2):
    res -= B[i]
    DP[res] = 0
print(sum(DP))