#include <bits/stdc++.h>
using namespace std;

using ll = long long;



int main()
{
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    int N, M;
    cin >> N >> M;
    vector<ll> P(N);
    for (int i = 0; i < N; i++)
    {
        cin >> P[i];
    }
    vector<set<int>> g(N, set<int>());
    for (int i = 0; i < N - 1; i++)
    {
        int a, b;
        cin >> a >> b;
        a--; b--;
        g[a].insert(b);
        g[b].insert(a);
    }

    vector<int> C(M);
    for (int i = 0; i < M; i++)
    {
        cin >> C[i];
    }

    vector<int> dist(N, -1);
    queue<pair<int, int>> q;
    for (int i = 0; i < M; i++)
    {
        q.emplace(C[i] - 1, 0);
    }

    while (!q.empty())
    {
        auto [n, d] = q.front();
        q.pop();

        if (dist[n] != -1) continue;
        dist[n] = d;

        for (int k : g[n])
        {
            q.emplace(k, d + 1);
        }
    }

    vector<int> deg(N);
    for (int i = 0; i < N; i++)
    {
        deg[i] = g[i].size();
    }

    priority_queue<tuple<ll, int, int>, vector<tuple<ll, int, int>>> pq;
    for (int i = 0; i < N; i++)
    {
        if (dist[i] != 0 && deg[i] == 1) pq.emplace(P[i], dist[i], i);
    }

    ll ans = 0;
    int time = 0;
    while (!pq.empty())
    {
        while (!pq.empty())
        {
            auto [p, d, i] = pq.top();
            if ( d > time )
            {
                ans += p;
                pq.pop();
                int par = *g[i].begin();
                g[par].erase(i);
                deg[par]--;
                if (deg[par] == 1)
                {
                    pq.emplace(P[par], dist[par], par);
                }
                break;
            }
            else
            {
                pq.pop();
            }
        }

        time++;
    }

    cout << ans << endl;
}