#include <bits/stdc++.h>
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
using namespace std;
using ll = long long;
const ll mod = 998244353;
#define fi first
#define se second
#define rep(i,n) for(ll i=0;i<n;i++)
#define all(x) x.begin(),x.end()
#define faster ios::sync_with_stdio(false);cin.tie(nullptr)

using P = pair<ll,ll>;

struct Edge{
    ll to;
    ll cost;
};

using Graph = vector<vector<Edge>>;
const ll INF = 1LL<<60;

void dijkstra(const Graph &G,ll s,vector<ll> &dis){
    ll N=G.size();
    dis.assign(N,INF);
    priority_queue<P,vector<P>,greater<P>> pq;
    dis[s]=0;
    pq.emplace(dis[s],s);
    while(!pq.empty()){
        P p=pq.top();
        pq.pop();
        ll v=p.se;
        if(p.fi>dis[v]) continue;
        for(auto &e:G[v]){
            if(dis[e.to]>dis[v]+e.cost){
                dis[e.to]=dis[v]+e.cost;
                pq.emplace(dis[e.to],e.to);
            }
        }
    }
}

int main() {
    ll N,M,L,S,E;
    cin >> N >> M >> L >> S >> E;
    ll ans=INF;
    Graph G(N);
    rep(i,M){
        ll a,b,t;
        cin >> a >> b >> t;
        G[a-1].push_back({b-1,t});
        G[b-1].push_back({a-1,t});
    }
    vector<ll> dis1,dis2;
    dijkstra(G,0,dis1);
    dijkstra(G,N-1,dis2);
    rep(i,L){
        ll t;
        cin >> t;
        t--;
        if(dis1[t]<=S+E-1){
            ans=min(ans,max(S,dis1[t])+1+dis2[t]);
        }
    }
    if(ans==INF){
        cout << -1 << endl;
    }else{
        cout << ans << endl;
    }
    return 0;
}