import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
n = ni()
b = [1] * (1+n)
m = ni()
a = na()

s = 0
for i in range(m):
    s += a[i]
    b[s] = 0

m = ni()
a = na()

for i in range(m):
    s -= a[i]
    b[s] = 0

print(sum(b))