nw = int(input())
l =[[int(i),1]for i in input().split()]
nb = int(input())
l = l + [[int(i),-1]for i in input().split()]
l = sorted(l,reverse=True)
ans =[0,0]
for i in range(2):
    s =(-1)**i
    w=l[0][0]+1
    for k in l:
        if k[1]==s and k[0]<w:
            ans[i] += 1
            s *= -1
            w = k[0]
print(max(ans))