n_w=int(input())
w=list(map(int,input().split()))
n_b=int(input())
b=list(map(int,input().split()))
w.sort()
b.sort()
w.reverse()
b.reverse()
array=[]
if b[0]<=w[0]:
    array.append(w[0])
    for i in range(min(n_b,n_w)):
        if b[i]<array[i]:
            array.append(b[i])
            if w[i+1]<array[i+1]:
                array.append(w[i+1])
if w[0]<=b[0]:
    array.append(b[0])
    for i in range(min(n_b,n_w)):
        if w[i]<array[i]:
            array.append(w[i])
            if b[i+1]<array[i+1]:
                array.append(b[i+1])
print(len(array))