import sys


def input(): return sys.stdin.readline().rstrip()


def solve(A, B):
    cur = max(B)
    ans = 1
    while True:
        A = [a for a in A if a < cur]
        if len(A) == 0:
            break
        cur = max(A)
        ans += 1
        A, B = B, A

    return ans


def main():
    int(input())  # Nw
    *W, = map(int, input().split())
    int(input())  # Nb
    *B, = map(int, input().split())

    print(max(solve(W, B), solve(B, W)))


if __name__ == '__main__':
    main()