package main

import . "fmt"
import . "os"
import bf "bufio"

func main() {
	rd:=bf.NewReader(Stdin)
	var n int
	Fscan(rd,&n)
	ss:=make([]int64,n+1)
	const M=1e9+7
	for i:=range ss {
		Fscan(rd,&ss[i])
		if i>0 {
			ss[i]+=ss[i-1]
			ss[i]%=M
		}
	}
	var ans int64
	for i:=range ss {
		var b int64
		Fscan(rd,&b)
		ans+=ss[n-i]*b
		ans%=M
	}
	Println(ans)
}