n = int(input())
TF=[True]*(n+1)

m1 = int(input())
lm1 = list(map(int,input().split()))
m2 = int(input())
lm2 = list(map(int,input().split()))

a=0
TF[a] = False
for i in range(m1):
    a+=lm1[i]
    TF[a] = False


for i in range(m2):
    a-=lm2[i]
    TF[a] = False

ans=0
for i in range(n):
    if TF[i]:
        ans+=1
print(ans)