def f(h,c,b,w,ans)
	if b.empty? ==true && c.empty? ==true
		return ans
	end
	if (c=="w" && b.empty? ==true) || (c=="b" && w.empty? ==true)
		return ans
	end
	res=0
	if c=="w"
		e=b.pop
		if e<h
			res=f(e,"b",b,w,ans+1)
		else
			res= f(h,"w",b,w,ans)
		end
		b.push(e)
	else
		e=w.pop
		if e<h
			res= f(e,"w",b,w,ans+1)
		else
			res= f(h,"b",b,w,ans)
		end
		w.push(e)
	end
	return res
end

gets
b=gets.split.map{|e| e.to_i}.sort
gets
w=gets.split.map{|e| e.to_i}.sort

e=b.pop
ans0=f(e,"b",b,w,1)
b.push(e)

e=w.pop
ans1=f(e,"w",b,w,1)
w.push(e)

puts [ans0,ans1].max