#include <cstdio>
#include <stdio.h>
#include <stdbool.h>
#include <iostream>
#include <map>
#include <vector>
#include <climits>
#include <stack>
#include <string>
#include <queue>
#include <algorithm>
#include <set>
#include <unordered_set>
#include <unordered_map>
#include <cmath>
#include <cctype>
#include <bitset>
#include <iomanip>
#include <cstring>
#include <numeric>
#include <cassert>
#include <random>
using namespace std;
#define int long long
#define pii pair<int, int>
#define mp make_pair
#define pb push_back
#define fi first
#define se second
const int MOD = 1000000007;
int32_t main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n, ans=0;
cin>>n;
vector<pii> vect(n);
for (int i=0; i<n; ++i)cin>>vect[i].fi;
for (int i=0; i<n; ++i)cin>>vect[i].se;
for (int i=0; i<n; ++i){
int mn=vect[i].fi;
ans=(ans+vect[i].fi*(vect[i].fi+1)/2%MOD*vect[i].se*(vect[i].se+1)/2)%MOD;
for (int j=i-1; j>=0; --j){
mn=min(mn, vect[j].fi);
ans=(ans+vect[i].se*vect[j].se%MOD*mn*(mn+1)/2)%MOD;
}
}
cout<<ans;
}
