main(){
    int n;
    short i;
    scanf("%d",&n);
    long long a[n+1],b[n+1],sum=0,ans=0;
    for(i=0;i<=n;++i)scanf("%lld",&a[i]);
    for(i=0;i<=n;++i)scanf("%lld",&b[i]);
    for(i=0;i<=n;++i){
        sum+=a[i];
        ans=(ans+sum*b[n-i])%1000000007;
    }
    printf("%lld\n",ans);
}