from itertools import accumulate


def main():
    N = int(input())
    Z = [0]*(N+1)
    input()
    *A, = accumulate(map(int, input().split()))
    input()
    *B, = accumulate(map(int, input().split()))
    for a in A:
        Z[a] = 1
    for b in B:
        Z[N-b] = 1

    print(N+1-sum(Z))


if __name__ == '__main__':
    main()