N = int(input())
state = [1]*(N+1)
v = 0
_ = input()
A = list(map(int, input().split()))
for a in A:
    v += a
    state[v] = 0
_ = input()
B = list(map(int, input().split()))
for b in B:
    v -= b
    state[v] = 0

print(sum(state))