n = int(input())
m1 = int(input())
a = list(map(int, input().split()))
m2 = int(input())
b = list(map(int, input().split()))
a1 = 0
A1 = []
for A in a:
    a1 += A
    A1.append(a1)
b1 = 0
B1 = []
for B in b:
    b1 += B
    B1.append(b1)
c = A1 + B1
c = set(c)
print(n - len(c))