#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main() {
    int m=1e9+7;
    int n;cin>>n;
    int a[n+1];
    for (int i=0;i<=n;i++) cin>>a[i];
    ll ans=0;
    ll sum=0;
    for (int i=0;i<=n;i++) {
        int b;cin>>b;
        sum=(sum+b)%m;
        ans=(ans+a[n-i]*sum%m)%m;
    }
    cout<<ans<<endl;
    return 0;
}