#include<bits/stdc++.h>
using namespace std;
using ll = long long;
const ll LNF = LLONG_MAX;

vector<ll> dijkstra(vector<vector<pair<int, int>>>& to, int s) {
  using P = tuple<ll, int>;
  priority_queue<P, vector<P>, greater<P>> pq;
  int n = to.size();
  vector<ll> dp(n, LNF);
  dp[s] = 0;
  pq.emplace(0, s);
  while (pq.size()) {
    auto [c, v] = pq.top(); pq.pop();
    if (dp[v] != c) continue;
    for (auto [u, w] : to[v]) {
      if (dp[u] <= c + w) continue;
      dp[u] = c + w;
      pq.emplace(c + w, u);
    }
  }
  return dp;
}

int main() {
  ll n, m, l, s, e; cin >> n >> m >> l >> s >> e;
  vector to(n, vector<pair<int, int>>());
  for (int i = 0; i < m; i++) {
    int u, v, w; cin >> u >> v >> w;
    u--, v--;
    to[u].emplace_back(v, w);
    to[v].emplace_back(u, w);
  }
  vector<int> T(l);
  for (int i = 0; i < l; i++) cin >> T[i], T[i]--;
  auto dp_0 = dijkstra(to, 0);
  auto dp_n = dijkstra(to, n - 1);
  ll ans = LNF;
  for (auto t : T) {
    if (dp_0[t] == LNF or dp_n[t] == LNF) continue;
    if (dp_0[t] <= s + e - 1) {
      ans = min(max(dp_0[t] + 1, s + 1) + dp_n[t], ans);
    }
  }
  if (ans == LNF) ans = -1;
  cout << ans << endl;
}