#include <iostream>
#include <vector>
using namespace std;
using ll = long long;
const ll MOD = 1000000007;
int main(){
    int n;cin>>n;
    vector<ll> A(n+1);
    vector<ll> B(n+1);
    for(int i = 0; n >= i; i++){
        cin>>A[i];
    }
    for(int i = 0; n >= i; i++){
        cin>>B[i];
    }
    vector<ll> b(n+2);
    b[0] = 0;
    for(int i = 1; n+1 >= i; i++){
        b[i] = (b[i-1]+B[i-1]);
    }
    ll ans = 0;
    for(int i = 0; n >= i; i++){
        ans = (ans+A[i]*b[n+1-i])%MOD;
    }
    cout << ans << endl;
}