#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000
#define int long long
int a[100010], b[100010];
int sum[100010];
signed main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N; cin >> N;
    N++;
    rep(i, N) cin >> a[i];
    rep(i, N) cin >> b[i];
    rep(i, N) sum[i + 1] = (sum[i] + b[i]) % mod;
    int ans = 0;
    rep(i, N) {
        ans = (a[i] * sum[N - i] + ans) % mod;
        //cout << ans << endl;
    }
    cout << ans << endl;


    return 0;
}