#include <bits/stdc++.h>
using namespace std;
using ll=long long;
const ll ILL=2167167167167167167;
const int INF=2100000000;
#define rep(i,a,b) for (int i=(int)(a);i<(int)(b);i++)
#define all(p) p.begin(),p.end()
template<class T> using _pq = priority_queue<T, vector<T>, greater<T>>;
template<class T> int LB(vector<T> &v,T a){return lower_bound(v.begin(),v.end(),a)-v.begin();}
template<class T> int UB(vector<T> &v,T a){return upper_bound(v.begin(),v.end(),a)-v.begin();}
template<class T> bool chmin(T &a,T b){if(b<a){a=b;return 1;}else return 0;}
template<class T> bool chmax(T &a,T b){if(a<b){a=b;return 1;}else return 0;}
template<class T> void So(vector<T> &v) {sort(v.begin(),v.end());}
template<class T> void Sore(vector<T> &v) {sort(v.begin(),v.end(),[](T x,T y){return x>y;});}
bool yneos(bool a,bool upp=false){if(a){cout<<(upp?"YES\n":"Yes\n");}else{cout<<(upp?"NO\n":"No\n");}return a;}
template<class T> void vec_out(vector<T> &p,int ty=0){
    if(ty==2){cout<<'{';for(int i=0;i<(int)p.size();i++){if(i){cout<<",";}cout<<'"'<<p[i]<<'"';}cout<<"}\n";}
    else{if(ty==1){cout<<p.size()<<"\n";}for(int i=0;i<(int)(p.size());i++){if(i) cout<<" ";cout<<p[i];}cout<<"\n";}}
template<class T> T vec_min(vector<T> &a){assert(!a.empty());T ans=a[0];for(auto &x:a) chmin(ans,x);return ans;}
template<class T> T vec_max(vector<T> &a){assert(!a.empty());T ans=a[0];for(auto &x:a) chmax(ans,x);return ans;}
template<class T> T vec_sum(vector<T> &a){T ans=T(0);for(auto &x:a) ans+=x;return ans;}
int pop_count(long long a){int res=0;while(a){res+=(a&1),a>>=1;}return res;}
template<class T> T square(T a){return a * a;}


std::vector<std::vector<int>> tree_in(int N){
    std::vector<std::vector<int>> G(N);
    for(int i=0;i<N-1;i++){
        int a;int b;
        cin>>a>>b;
        a--,b--;
        G[a].push_back(b);
        G[b].push_back(a);
    }
    return G;
}
std::tuple<std::vector<int>,std::vector<int>,std::vector<int>> tree_order_pare_depth(std::vector<std::vector<int>> &G,int root=0){
    int n=G.size();
    std::vector<int> order={root},pare(n,-1),depth(n);
    pare[root]=-2;
    for(int i=0;i<n;i++){
        int a=order[i];
        for(auto x:G[a]){
            if(pare[x]==-1){
                pare[x]=a;
                depth[x]=depth[a]+1;
                order.push_back(x);
            }
        }
    }
    return {order,pare,depth};
}
std::vector<int> tree_diameter_path(std::vector<std::vector<int>> &G){
    int n=G.size();
    auto r=(std::get<0>(tree_order_pare_depth(G,0))).at(n-1);
    std::vector<int> order,pare,depth,ans;
    tie(order,pare,depth)=tree_order_pare_depth(G,r);
    int ind=order[n-1];
    while(ind!=-2){
        ans.push_back(ind);
        ind=pare[ind];
    }
    return ans;
}

#include <atcoder/segtree>
int op(int a, int b){
    return min(a, b);
}
int e(){
    return INF;
}

bool f(int x){
    return x > 1;
}

void solve();
// POP'N ROLL MUSIC / TOMOO
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int t = 1;
    // cin >> t;
    rep(i, 0, t) solve();
}

void solve(){
    int N, K;
    cin >> N >> K;
    vector<int> p(N);
    rep(i, 0, N) cin >> p[i];
    vector<int> order(N);
    rep(i, 0, N) order[i] = i;
    sort(all(order), [&](int l, int r){
        return p[l] > p[r];
    });
    auto G = tree_in(N);
    ll ans = 0;
    atcoder::segtree<int, op, e> seg(N);
    vector<int> inv(N);
    rep(i, 0, N) inv[order[i]] = i;
    rep(i, 0, N) seg.set(inv[i], (int)G[i].size());
    vector<int> seen;
    rep(i, 0, K){
        int a;
        cin >> a;
        a--;
        seg.set(inv[i], INF);
        seen.push_back(a);
    }
    while (seg.all_prod() < N){
        int a = seg.max_right<f>(0);
        if (a != N){
            seg.set(a, INF);
            ans += p[order[a]];
            for (auto x : G[order[a]]){
                seg.set(inv[x], seg.get(inv[x]) - 1);
            }
        }
        vector<int> n_seen;
        for (auto y : seen){
            for (auto x : G[y]) if (seg.get(inv[x]) < N){
                seg.set(inv[x], INF);
                n_seen.push_back(x);
            }
        }
        swap(n_seen, seen);
    }
    cout << ans << "\n";
}