from collections import defaultdict, deque
from sys import stdin

readline = stdin.readline


def li():
    return list(map(int, readline().split()))


N = int(input())
M1 = int(input())
A = li()
M2 = int(input())
B = li()

ans = [1] * (N + 1)
ans[0] = 0
ans[N] = 0
# のぼり
pos = 0
for a in A:
    pos += a
    ans[pos] = 0
# くだり
for b in B:
    pos -= b
    ans[pos] = 0

print(sum(ans))