#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int N;
  cin>>N;
  vector<int> A(N),B(N);
  for(int i=0;i<N;i++){
      cin>>A[i];
      A[i] = 10000000-A[i];
  } 
  for(int i=0;i<N;i++) cin>>B[i];
  vector<pair<int,int>> S(N);
  for(int i=0;i<N;i++) S[i] = {B[i],A[i]};
  sort(S.rbegin(),S.rend());
  int ans = 0;
  int now = 1;
  int mod = 1000000007;
  for(int i=0;i<N;i++){
      ans += now*(10000000-S[i].second);
      ans %= mod;
      now *= (S[i].first);
      now %= mod;
  }
  cout<<ans<<endl;
}