#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define sz(a) (int)a.size()
const int mxN = (int)1e5+10;
const int MOD = (int)1e9+7;
int Tw, Th;
int n, h[mxN], w[mxN];
vector<pair<int,int>> v;
int poww(int a, int b){
if(!b) return 1;
int x = poww(a,b/2);
x*=x, x%=MOD;
if(b&1) x*=a, x%=MOD;
return x;
}
int32_t main(){
cin >> n; int ans = 0; int div2 = poww(2,MOD-2);
for(int i = 1; i <= n; i++) cin >> h[i];
for(int i = 1; i <= n; i++) cin >> w[i];
for(int i = 1; i <= n; i++){
int W = w[i]; Tw+=w[i], Th+=h[i]; Tw%=MOD, Th%=MOD;
while(i<n and h[i]==h[i+1]) W+=w[++i], W%=MOD;
v.pb({h[i],W});
}
ans = Tw*(Tw+1); ans%=MOD; ans*=div2; ans%=MOD;
n = sz(v);
for(auto [h,w] : v){
//cout << h << " " << w << "\n";
if(h==1) continue;
ans+=w*(w+1); ans%=MOD;
}
cout << ans;
}
