#include <queue>
#include <iostream>
#include <vector>
#include <cstring>
#include <iostream>
#include <set>
#include <cstring>
//#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int maxn = 1e5 + 10;
const ll INF = 3e16 + 10;
int n, m, k;
vector<pair<int, int> > graph[maxn];
int cities[maxn];
bool to_build[maxn];
struct node {
    int idx;
    ll cost;

    node () {}
    node(int _idx, ll _cost) {
        idx = _idx;
        cost = _cost;
    }
    bool operator < (const node &tmp) const {
        return cost > tmp.cost;
    }
};
pair<int, ll> find_nearest_city() {
    vector<ll> dist(n, INF);
    vector<bool> visited(n, false);
    dist[0] = 0;
    priority_queue<node> pq;
    pq.push(node(0, 0));
    while(!pq.empty()) {
        node c = pq.top();
        pq.pop();
        if(visited[c.idx]) continue;
        visited[c.idx] = true;

        for(int i = 0; i < (int) graph[c.idx].size(); i++) {
            int neighbour = graph[c.idx][i].first;
            ll weight = graph[c.idx][i].second;


            if(!visited[neighbour] and c.cost + weight < dist[neighbour]) {
                dist[neighbour] = c.cost + weight;
                pq.push(node(neighbour, dist[neighbour]));
            }
        }
    }
    ll shortest_distance = INF;
    int nearest_city = -1;
    for(int i = 0; i < k; i++) {
        if(shortest_distance > dist[cities[i]]) {
            shortest_distance = dist[cities[i]];
            nearest_city = cities[i];
        }
    }
    return make_pair(nearest_city, shortest_distance);
}
ll dijkstra(int S) {
    vector<ll> dist(n, INF);
    dist[S] = 0;
    priority_queue<node> pq;
    pq.push(node(S, 0));
    set<int> st;
    ll result = 0;
    while(!pq.empty() and (int) st.size() < k) {
        node c = pq.top();
        pq.pop();

        if(c.cost > dist[c.idx]) continue;

        if(to_build[c.idx]) {
            result += c.cost;
            c.cost = 0;
            to_build[c.idx] = false;
            st.insert(c.idx);
        }
        dist[c.idx] = c.cost;
        for(int i = 0; i < (int) graph[c.idx].size(); i++) {
            int neighbour = graph[c.idx][i].first;
            ll weight = graph[c.idx][i].second;
            pq.push(node(neighbour, c.cost + weight));
        }

    }
    return result;
}
int main() {
    ios_base::sync_with_stdio(false);
    memset(to_build, false, sizeof to_build);
    cin >> n >> m;
    for(int i = 0; i < m; i++) {
        int a, b, c;
        cin >> a >> b >> c;
        graph[a].push_back(make_pair(b, c));
        graph[b].push_back(make_pair(a, c));
    }
    cin >> k;
    for(int i = 0; i < k; i++) {
        cin >> cities[i];
        to_build[cities[i]] = true;
    }
    pair<int, ll> nearest_city = find_nearest_city();
    ll result = dijkstra(nearest_city.first);

    cout << nearest_city.second + result << endl;

    return 0;
}