f=lambda m:[(int(n),m) for n in input().split()]
input();p0=f(1)
input();p1=f(2)
p=sorted(p0+p1)
def g(b):
	a=n=0
	for c,d in p:
		if c>a and d!=b:
			a,b,n=c,d,n+1
	return n
print(max(g(1),g(2)))