from collections import defaultdict
N=int(input())
M1=int(input())
A=list(map(int,input().split()))
M2=int(input())
B=list(map(int,input().split()))
dic=defaultdict(int)
count=0
for i in range(M1):
    count+=A[i]
    dic[count]+=1
count=N
for i in range(M2):
    count-=B[i]
    dic[count]+=1
print(N+1-len(dic))