def func(na, la, nb, lb):
    c = 1
    a = 0
    b = 0
    while a < na and b < nb:
        while b < nb and lb[b] <= la[a]:
            b += 1
        if b < nb:
            c += 1
        else:
            break
        a += 1
        while a < na and la[a] <= lb[b]:
            a += 1
        if a < na:
            c += 1
    return c

nw = int(raw_input())
lw = sorted(map(int, raw_input().split()))
nb = int(raw_input())
lb = sorted(map(int, raw_input().split()))

print max(func(nw,lw,nb,lb), func(nb,lb,nw,lw))