n = int(input())
m1 = int(input())
a = list(map(int,input().split()))
m2 = int(input())
b = list(map(int,input().split()))
r = set()
tmp = 0
r.add(0)
for i in range(m1):
	tmp += a[i]
	r.add(tmp)
for i in range(m2):
	tmp -= b[i]
	r.add(tmp)
print(n + 1 - len(r))