#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
int gcd(int a,int b){return b?gcd(b,a%b):a;}
#define MOD 1000000007

ll a[100001],b[100001];

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n;
    ll c=0,d=0;
    cin >> n;
    rep(i,n+1) {
        cin >> a[i];
    }
    rep(i,n+1) {
        cin >> b[i];
    }
    rep(i,n+1) {
        rep(j,n-i+1) {
            d+=b[j]%MOD;
            d%=MOD;
        }
        c+=a[i]*d%MOD;
        c%=MOD;
    }
    cout << c << endl;
    return 0;
}