Since Boboniu finished building his Jianghu, he has been doing Kungfu on these mountains every day. 

Boboniu designs a map for his n mountains. He uses n-1 roads to connect all n mountains. Every pair of mountains is connected via roads.

For the i-th mountain, Boboniu estimated the tiredness of doing Kungfu on the top of it as t_i. He also estimated the height of each mountain as h_i.

A path is a sequence of mountains M such that for each i (1 ≤ i < |M|), there exists a road between M_i and M_{i+1}. Boboniu would regard the path as a challenge if for each i (1≤ i<|M|), h_{M_i}≤ h_{M_{i+1}}.

Boboniu wants to divide all n-1 roads into several challenges. Note that each road must appear in exactly one challenge, but a mountain may appear in several challenges. 

Boboniu wants to minimize the total tiredness to do all the challenges. The tiredness of a challenge M is the sum of tiredness of all mountains in it, i.e. ∑_{i=1}^{|M|}t_{M_i}. 

He asked you to find the minimum total tiredness. As a reward for your work, you'll become a guardian in his Jianghu.

Input

The first line contains a single integer n (2 ≤ n ≤ 2 ⋅ 10^5), denoting the number of the mountains.

The second line contains n integers t_1, t_2, …, t_n (1 ≤ t_i ≤ 10^6), denoting the tiredness for Boboniu to do Kungfu on each mountain.

The third line contains n integers h_1, h_2, …, h_n (1 ≤ h_i ≤ 10^6), denoting the height of each mountain.

Each of the following n - 1 lines contains two integers u_i, v_i (1 ≤ u_i, v_i ≤ n, u_i ≠ v_i), denoting the ends of the road. It's guaranteed that all mountains are connected via roads.

Output

Print one integer: the smallest sum of tiredness of all challenges.

Examples

Input


5
40 10 30 50 20
2 3 2 3 1
1 2
1 3
2 4
2 5


Output


160


Input


5
1000000 1 1 1 1
1000000 1 1 1 1
1 2
1 3
1 4
1 5


Output


4000004


Input


10
510916 760492 684704 32545 484888 933975 116895 77095 127679 989957
402815 705067 705067 705067 623759 103335 749243 138306 138306 844737
1 2
3 2
4 3
1 5
6 4
6 7
8 7
8 9
9 10


Output


6390572

Note

For the first example:

<image>

In the picture, the lighter a point is, the higher the mountain it represents. One of the best divisions is:

  * Challenge 1: 3 → 1 → 2 
  * Challenge 2: 5 → 2 → 4 



The total tiredness of Boboniu is (30 + 40 + 10) + (20 + 10 + 50) = 160. It can be shown that this is the minimum total tiredness.
#include <bits/stdc++.h>
using namespace std;
using lint = long long;
using pi = pair<lint, lint>;
const lint inf = 1e12;
const int MAXN = 500005;
vector<int> gph[MAXN];
lint up[MAXN], dn[MAXN];
lint t[MAXN], h[MAXN];
void dfs(int x, int p) {
  vector<pi> v;
  lint tot = 0;
  lint sum = 0;
  for (auto &i : gph[x]) {
    if (i != p) {
      dfs(i, x);
      if (h[i] > h[x]) up[i] = -inf;
      if (h[i] < h[x]) dn[i] = -inf;
      v.emplace_back(up[i], dn[i]);
      sum += up[i];
    }
  }
  sort((v).begin(), (v).end(), [&](const pi &a, const pi &b) {
    return a.second - a.first > b.second - b.first;
  });
  up[x] = dn[x] = -inf;
  {
    lint foo = sum;
    int in = ((int)(gph[x]).size()) - 1, out = 1;
    up[x] = max(up[x], foo + min(in, out) * t[x]);
    for (auto &i : v) {
      foo += i.second - i.first;
      in--;
      out++;
      up[x] = max(up[x], foo + min(in, out) * t[x]);
    }
  }
  {
    lint foo = sum;
    int in = ((int)(gph[x]).size()), out = 0;
    dn[x] = max(dn[x], foo + min(in, out) * t[x]);
    for (auto &i : v) {
      foo += i.second - i.first;
      in--;
      out++;
      dn[x] = max(dn[x], foo + min(in, out) * t[x]);
    }
  }
}
lint solve() {
  vector<pi> v;
  lint sum = 0;
  int x = 1;
  for (auto &i : gph[1]) {
    dfs(i, 1);
    if (h[i] > h[x]) up[i] = -inf;
    if (h[i] < h[x]) dn[i] = -inf;
    v.emplace_back(up[i], dn[i]);
    sum += up[i];
  }
  sort((v).begin(), (v).end(), [&](const pi &a, const pi &b) {
    return a.second - a.first > b.second - b.first;
  });
  lint foo = sum;
  int in = ((int)(gph[x]).size()), out = 0;
  lint dap = -inf;
  dap = max(dap, foo + min(in, out) * t[x]);
  for (auto &i : v) {
    foo += i.second - i.first;
    in--;
    out++;
    dap = max(dap, foo + min(in, out) * t[x]);
  }
  return dap;
}
int main() {
  int n;
  scanf("%d", &n);
  for (int i = 1; i <= n; i++) scanf("%lld", &t[i]);
  for (int i = 1; i <= n; i++) scanf("%lld", &h[i]);
  for (int i = 1; i < n; i++) {
    int u, v;
    scanf("%d %d", &u, &v);
    gph[u].push_back(v);
    gph[v].push_back(u);
  }
  lint ret = 0;
  for (int i = 1; i <= n; i++) {
    ret += 1ll * ((int)(gph[i]).size()) * t[i];
  }
  cout << ret - solve() << endl;
}
