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

L=[1]*(n+1)
tmp=0
for i in range(a):
  tmp+=A[i]
  L[tmp]=0
for i in range(b):
  tmp-=B[i]
  L[tmp]=0
print(sum(L))