N = int(input())

M1 = int(input())
A = list(map(int,input().split()))

M2 = int(input())
B = list(map(int,input().split()))

done = [True]*(N+1)
c = 0
for a in A:
    c += a
    done[c] = False
for b in B:
    c -= b
    done[c] = False
res = done.count(1)
print(res)