// Source: https://usaco.guide/general/io
#include <bits/stdc++.h>
#include <cctype>
using namespace std;
#define ll long long
const int MOD=1e9+7;
int main() {
ll n;cin>>n;
// vector<int>h(n);
ll sum=0;
ll h,w;
for(int i=0;i<n;i++){
cin>>h;
}
for(int i=0;i<n;i++){
cin>>w;
sum+=w;
}
ll ans=0;
for(int i=sum;i>=1;i--){
for(int j=h;j>=1;j--){
// cout<<i<<" "<<j<<endl;
ans+=(((i%MOD)*(j%MOD))%MOD);
ans%=MOD;
}
}
cout<<ans%MOD;;
}
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