n = int(input())
m1 = int(input())
used = [1]*(n+1)
now = 0
for a in list(map(int,input().split())):
	now += a
	used[now] = 0

m2 = int(input())
for a in list(map(int,input().split())):
	now -= a
	used[now] = 0
print(sum(used))