package main

import (
	"bufio"
	"fmt"
	"math"
	"os"
	"strconv"
)

func main() {
	var n int
	_, _ = fmt.Scan(&n)
	mod := int(math.Pow10(9)) + 7

	sc := bufio.NewScanner(os.Stdin)
	an := make([]int, n+1)
	for i := range an {
		sc.Scan()
		an[i], _ = strconv.Atoi(sc.Text())
	}
	bn := make([]int, n+1)
	for i := range bn {
		sc.Scan()
		bn[i], _ = strconv.Atoi(sc.Text())
	}
	// fmt.Println(an)
	// fmt.Println(bn)

	ans := 0
	for i := 0; i <= n; i++ {
		for j := 0; j <= n-i; j++ {
			ans = (ans + an[i]*bn[j]) % mod
		}
	}
	fmt.Println(ans)
}