#include <bits/stdc++.h>
using namespace std;

#define CPP_STR(x) CPP_STR_I(x)
#define CPP_CAT(x, y) CPP_CAT_I(x, y)
#define CPP_STR_I(args...) #args
#define CPP_CAT_I(x, y) x##y

#define ASSERT(expr...) assert((expr))

using i8 = int8_t;
using u8 = uint8_t;
using i16 = int16_t;
using u16 = uint16_t;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;

using f32 = float;
using f64 = double;
// }}}

constexpr i64 INF = 1'010'000'000'000'000'017LL;

constexpr i64 MOD = 998244353LL;

constexpr f64 EPS = 1e-12;

constexpr f64 PI = 3.14159265358979323846;

#define M5 100007
#define M9 1000000000

#define F first
#define S second

// util {{{
#define FOR(i, start, end) for (i64 i = (start), CPP_CAT(i, xxxx_end) = (end); i < CPP_CAT(i, xxxx_end); ++i)
#define REP(i, n) FOR(i, 0, n)

#define all(x) (x).begin(), (x).end()
#define ll long long int
#define VI vector<ll>
#define VVI vector<VI>

#define ISD true
#define debug(x) \
    if (ISD)     \
    cout << #x << ": " << x << endl

template <typename T, typename U, typename Comp = less<>>
bool chmax(T &xmax, const U &x, Comp comp = {})
{
    if (comp(xmax, x))
    {
        xmax = x;
        return true;
    }
    return false;
}

template <typename T, typename U, typename Comp = less<>>
bool chmin(T &xmin, const U &x, Comp comp = {})
{
    if (comp(x, xmin))
    {
        xmin = x;
        return true;
    }
    return false;
}

struct Edge
{
    long long to;
    long long cost;
};
using Graph = vector<vector<Edge>>;
using P = pair<long, int>;
/* dijkstra(G,s,dis)
    入力：グラフ G, 開始点 s, 距離を格納する dis
    計算量：O(|E|log|V|)
    副作用：dis が書き換えられる
*/
void dijkstra(const Graph &G, int s, vector<long long> &dis)
{
    int N = G.size();
    dis.resize(N, INF);
    priority_queue<P, vector<P>, greater<P>> pq; // 「仮の最短距離, 頂点」が小さい順に並ぶ
    dis[s] = 0;
    pq.emplace(dis[s], s);
    while (!pq.empty())
    {
        P p = pq.top();
        pq.pop();
        int v = p.second;
        if (dis[v] < p.first)
        { // 最短距離で無ければ無視
            continue;
        }
        for (auto &e : G[v])
        {
            if (dis[e.to] > dis[v] + e.cost)
            { // 最短距離候補なら priority_queue に追加
                dis[e.to] = dis[v] + e.cost;
                pq.emplace(dis[e.to], e.to);
            }
        }
    }
}

int main()
{
    int N, M, L, S, E;
    cin >> N >> M >> L >> S >> E;
    Graph G(N);
    REP(i, M)
    {
        int a, b, t;
        cin >> a >> b >> t;
        a--;
        b--;
        G[a].push_back({b, t});
        G[b].push_back({a, t});
    }
    vector<ll> T(L);
    REP(i, L)
    {
        cin >> T[i];
        T[i]--;
    }
    vector<ll> d1, d2;
    dijkstra(G, 0, d1);
    dijkstra(G, N - 1, d2);
    ll ans = INF;
    REP(i, L)
    {
        if (d1[T[i]] > S + E)
        {
            continue;
        }
        chmin(ans, max((ll)S, d1[T[i]]) + 1 + d2[T[i]]);
    }
    if (ans == INF)
    {
        cout << -1 << endl;
    }
    else
    {
        cout << ans << endl;
    }
}