#include<iostream>
using namespace std;
long ans,mod=1e9+7,a[1<<17],b[1<<17],n;
main()
{
	cin>>n;
	for(int i=0;i<=n;i++)cin>>a[i];
	for(int i=0;i<=n;i++)cin>>b[i];
	for(int i=1;i<=n;i++)a[i]=(a[i]+a[i-1])%mod;
	for(int i=0;i<=n;i++)ans=(ans+b[i]*a[n-i])%mod;
	cout<<ans<<endl;
}