n=int(input())
m1=int(input())
a=list(map(int,input().split()))
m2=int(input())
b=list(map(int,input().split()))
skipped=[True for i in range(n+1)]
cur=0
for i in range(m1):
 cur+=a[i]
 skipped[cur]=False
for i in range(m2):
 cur-=b[i]
 skipped[cur]=False
print(sum(skipped))