#include <bits/stdc++.h>

typedef long double ld;
typedef long long ll;
using namespace std;
int di[] = {1, 0, -1, 0, -1, 1, -1, 1};
int dj[] = {0, 1, 0, -1, -1, 1, 1, -1};
const ll oo = 1e18, MOD = 998244353;
const int N = 1005, M = 1e6 + 5;
const ld PI = acos(-1.0), EPS = 1e-9;

//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
//using namespace __gnu_pbds;
//typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

ll n, m, p, g, idx[N], dis[N][N], vis[N][N];
vector<pair<int, int> > v[N];

void dijkstra(int s) {
    for (int i = 1; i <= n; i++) dis[s][i] = oo;
    dis[s][s] = 0;
    priority_queue<pair<int, ll>> q;
    q.push({0, s});
    while (!q.empty()) {
        int node = q.top().second;
        ll cost = -q.top().first;
        q.pop();
        if (cost != dis[s][node]) continue;
        for (auto x:v[node]) {
            if (dis[s][x.first] > x.second + dis[s][node]) {
                dis[s][x.first] = x.second + dis[s][node];
                q.push({-dis[s][x.first], x.first});
            }
        }
    }
}

void build(int s, int node) {
    vis[s][node] = 1;
    for (auto x:v[node]) {
        if (dis[1][node] == dis[1][x.first] + x.second && !vis[s][x.first]) {
            build(s, x.first);
        }
    }
}

//#define endl '\n'
int main() {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    //freopen("farm.in", "r", stdin);
    //memset(dp, -1, sizeof dp);
    cin >> n >> m >> p >> g;
    for (int i = 1; i <= p; i++) cin >> idx[i];
    while (m--) {
        int x, y, c;
        cin >> x >> y >> c;
        v[x].push_back({y, c});
        v[y].push_back({x, c});
    }
    dijkstra(1);
    for (int i = 1; i <= p; i++) dijkstra(idx[i]);
    for (int i = 1; i <= p; i++) build(idx[i], idx[i]);
    ll ans = oo;
    for (int i = 1; i <= n; i++) {
        ll tmp = 0;
        for (int j = 1; j <= p; j++) {
            if (vis[idx[j]][i]) tmp += min(dis[idx[j]][1], g + dis[idx[j]][i]);
            else tmp += dis[idx[j]][1];
        }
        ans = min(ans, tmp);
    }
    cout << ans;
    return 0;
}