package main

import (
	"fmt"
	"sort"
)

func main() {
	var n int
	fmt.Scan(&n)
	a, b := make([]int, n), make([]int, n)
	for i := range a {
		fmt.Scan(&a[i])
	}
	for i := range b {
		fmt.Scan(&b[i])
	}
	sort.Ints(a)
	sort.Sort(sort.Reverse(sort.IntSlice(b)))
	s := 0
	for i := 0; i < n; i++ {
		s += a[i] * b[i]
	}
	fmt.Println(s)
}