package main

import . "fmt"
import . "slices"

func main() {
	var n int
	Scan(&n)
	a:=make([]int,n)
	b:=make([]int,n)
	for i:=range a {
		Scan(&a[i])
	}
	for i:=range b {
		Scan(&b[i])
	}
	Sort(a)
	
	x,y,z:=0,1,0
	for _,v:=range a {
		c:=0
		for _,w:=range b {
			if v>=w {
				c++
			}
		}
		if c>0 {
			y*=x+c
			x+=c-1
		} else {
			z++
		}
	}
	y*=z*(z+1)/2
	Println(y)
	
}