Nw = int(input())
white_block = np.array(list(map(int, input().split())))
Nb = int(input())
black_block = np.array(list(map(int, input().split())))


under_block = np.max(np.concatenate([white_block, black_block]))
if under_block in black_block:
    colour = 1
else:
    colour = 0

count = 1
while np.sum(white_block < under_block) > 0 or np.sum(black_block < under_block) > 0:
    if colour == 1:
        try:
            under_block = np.max(white_block[white_block < under_block])
        except:
            break
        count += 1
        colour = 0
    elif colour == 0:
        try:
            under_block = np.max(black_block[black_block < under_block])
        except:
            break
        count += 1
        colour = 1

print(count)