#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef vector<ll> vi;
typedef vector<vector<ll>> vvi;
typedef pair<ll,ll> pi;
typedef map<ll,ll> mi;
typedef long double ld;
typedef vector<ld> vd;
typedef vector<vector<ld>> vvd;
typedef pair<ld,ld> pd;
#define ff first
#define ss second
#define srt(a) sort(a.begin(),a.end());
#define fip(k, n) for (ll i = k; i < n; i++)
#define fjp(k, n) for (ll j = k; j < n; j++)
#define fin(k, n) for (ll i = k; i >= n; i--)
#define fjn(k, n) for (ll j = k; j >= n; j--)
#define fp(k, n, m) for (ll k = n; k < m; k++)
#define fn(k, n, m) for (ll k = n; k >= m; k--)
#define ordered_set tree<pi, null_type,less< pi >, rb_tree_tag,tree_order_statistics_node_update>
#define totalOne(n) __builtin_popcount(n)
#define backZero(n) __builtin_ctzll(n)
#define frontZero(n) __builtin_clzll(n)
#define fx(k) for ( auto x : k )
#define test ll t;cin >> t;while (t--)
#define nli "\n"
// ==========================(debug)============================================================================================== //
#ifdef SAMI
#define debug(x) cerr<<#x;cerr<<" ";_printn(x);cerr<<nli;
#define debg() cerr<<nli;
#else
#define debug(x)
#define debg()
#endif
void _printn(ll x){ cerr<<x<<" "; }
void _printn(int x){ cerr<<x<<" "; }
void _printn(ld x){ cerr<<x<<" "; }
void _printn(double x){ cerr<<x<<" "; }
void _printn(string x){ cerr<<x<<" "; }
void _printn(char x){ cerr<<x<<" "; }
void _printn(bool x){ cerr<<x<<" "; }
template<class T,class V>void _printn(pair<T,V> vv);
template<class T> void _printn(vector<T> vv);
template<class T> void _printn(set<T> vv);
template<class T,class V> void _printn(map<T,V> vv);
template<class T> void _printn(multiset<T> vv);
template<class T,class V>void _printn(pair<T,V> vv){ cerr<<"( ";_printn(vv.ff);cerr<<",";_printn(vv.ss);cerr<<")";}
template<class T> void _printn(vector<T> vv){ cerr<<"[ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"]"; };
template<class T> void _printn(set<T> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };
template<class T> void _printn(multiset<T> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };
template<class T,class V> void _printn(map<T,V> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };
// ==========================(debug)============================================================================================== //
ll n,m,tp,tp2,res,cnt,sum,tptp,ans;
const ll mx = 5e5+5;
const ll mod = 1e9+7;
// ==========================(MOD)=============================================================================================== //
ll mod_add(ll aa,ll bb){ return ((aa%mod)+(bb%mod))%mod; }
ll mod_minus(ll aa,ll bb){ return (((aa%mod)-(bb%mod))+10*mod)%mod; }
ll mod_mul(ll aa,ll bb){ return ((aa%mod)*(bb%mod))%mod; }
ll mod_power(ll aa,ll bb){ aa%=mod; ll empowered = 1; bb%=mod-1; while(bb > 0){ if(bb & 1) empowered = mod_mul(empowered,aa); bb = bb >> 1; aa = mod_mul(aa,aa); } return empowered; }
ll mod_divi(ll aa,ll bb){ aa=mod_mul(aa,mod_power(bb,mod-2)); return aa; }
// ==========================(MOD)=============================================================================================== //
bool f = false;
ll a[mx];
ll b[mx];
bool mark[mx];
vector<pi> v;
ll get(ll k){
return ((k*(k+1))/2)%mod;
}
typedef struct disjoint_set_union{
vi par,sz,dis,h;
ll range,src,dest;
void init(ll k){
range = k + 5;
par.resize(range);
dis.resize(range);
sz.resize(range);
h.resize(range);
fip(0,range){
par[i] = i;
sz[i] = 1;
dis[i] = b[i];;
h[i] = a[i];
}
return;
}
ll find(ll k){
return (par[k] == k ? k : par[k] = find(par[k]));
}
bool unite(ll u,ll v){
src = find(u);
dest = find(v);
if(src==dest)
return 0;
if(sz[src] < sz[dest])swap(src,dest);
par[dest] = src;
sz[src] += sz[dest];
// debug(src);
// debug(dest);
// debug(ans);
if(h[src] > h[dest]){
res = get(h[src]) - get(h[dest]) + 10 * mod;
res %= mod;
sum = get(dis[src]);
sum %= mod;
ans += (res*sum)%mod;
ans %= mod;
}else{
res = get(h[dest]) - get(h[src]) + 10 * mod;
res %= mod;
sum = get(dis[dest]);
sum %= mod;
ans += (res*sum)%mod;
ans %= mod;
}
// debug(ans);
// debg();
dis[src] += dis[dest];
dis[src] %= mod;
h[src] = min(h[src],h[dest]);
return 1;
}
}DSU;
DSU dsu;
int main(){
ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#ifdef SAMI
freopen("input1.txt", "r", stdin);
freopen("output1.txt", "w", stdout);
freopen("error1.txt", "w", stderr);
#endif // ONLINE_JUDGE
cin>>n;
fip(0,n+2)
mark[i] = 0;
fip(1,n+1){
cin>>a[i];
v.push_back({-a[i],i});
}
v.push_back({0,0});
v.push_back({0,n+1});
fip(1,n+1)
cin>>b[i];
dsu.init(n);
srt(v);
fip(0,n)
v[i].ff = -v[i].ff;
ll i = 0;
vi vv;
set<ll>st;
ans = 0;
// debug(v);
while(i<n+2){
vv.clear();
vv.push_back(v[i].ss);
tp = a[v[i].ss];
mark[v[i].ss] = 1;
while(i+1<n+2 && v[i+1].ff==v[i].ff){
i++;
vv.push_back(v[i].ss);
mark[v[i].ss] = 1;
}
debug(vv);
fx(vv){
debug(x)
if(mark[x+1])
dsu.unite(x,x+1);
if(x-1>=0 && mark[x-1])
dsu.unite(x,x-1);
}
debug(ans);
i++;
}
cout<<ans<<nli;
cerr << "Time elapsed: " << setprecision(6) << 1000.0 * clock() / CLOCKS_PER_SEC << "ms\n";
return 0;
}
