#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
using namespace std;

const int INF = INT_MAX / 4;

vector<int> a;
vector<vector<int> > edges;

int solve(int curr, int prev, bool isLarge, int prevValue, int& ans)
{
    map<int, int> maxValue;
    for(int next : edges[curr]){
        if(next == prev)
            continue;
        int value = solve(next, curr, !isLarge, a[curr], ans);
        if(a[curr] == a[next] || (isLarge ^ (a[curr] < a[next])))
            continue;
        maxValue[a[next]] = max(maxValue[a[next]], value);
    }

    int score = maxValue.size() * (maxValue.size() - 1) / 2;
    for(const auto& p : maxValue)
        score += p.second;
    ans = max(score, ans);

    maxValue[prevValue] = 0;
    score = maxValue.size() * (maxValue.size() - 1) / 2;
    for(const auto& p : maxValue)
        score += p.second;
    return score;
}

int main()
{
    int n;
    cin >> n;
    a.resize(n);
    for(int i=0; i<n; ++i)
        cin >> a[i];

    edges.assign(n, vector<int>());
    for(int i=0; i<n-1; ++i){
        int x, y;
        cin >> x >> y;
        -- x;
        -- y;
        edges[x].push_back(y);
        edges[y].push_back(x);
    }

    int ans = 0;
    solve(0, -1, true, INF, ans);
    solve(0, -1, false, -INF, ans);
    cout << ans << endl;

    return 0;
}