#include <bits/stdc++.h>

using namespace std;

#define INF 100000000
#define YJ 1145141919
#define INF_INT_MAX 2147483647
#define INF_LL 9223372036854775
#define INF_LL_MAX 9223372036854775807
#define EPS 1e-10
#define MOD 1000000007
#define MOD9 998244353
#define Pi acos(-1)
#define LL long long
#define ULL unsigned long long
#define LD long double

#define int long long

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(a)  begin((a)), end((a))
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define MP make_pair
#define SZ(a) int((a).size())

const int MAX_N = 100005;
int N;
int A[MAX_N];
int B[MAX_N];
int sumB[MAX_N];

signed main()
{
  cin >> N; N++;
  REP(n,N) {
    cin >> A[n];
  }
  REP(n,N) {
    cin >> B[n];
    sumB[n+1] = (sumB[n] + B[n]) % MOD;
  }

  int ans = 0;
  REP(n,N) {
    ans += A[n]*sumB[N-n];
    ans %= MOD;
  }

  cout << ans << endl;

  return 0;
}