# No.110 しましまピラミッド
def make_pyramid(A, B):
    cur, ret = float("inf"), 0
    memo_a, memo_b = 0, 0
    N, M = len(A), len(B)
    for _ in range(max(N, M)):
        for i, a in enumerate(A[memo_a:], memo_a):
            if a < cur:
                cur, memo_a = a, i
                ret += 1
                break
        else:
            break

        for i, b in enumerate(B[memo_b:], memo_b):
            if b < cur:
                cur, memo_b = b, i
                ret += 1
                break
        else:
            break
    return ret


def main():
    _ = input()
    W = sorted(map(int, input().rstrip().split()), reverse=1)
    _ = input()
    B = sorted(map(int, input().rstrip().split()), reverse=1)
    ans = max(make_pyramid(W, B), make_pyramid(B, W))
    print(ans)


if __name__ == "__main__":
    main()