//https://yukicoder.me/submissions/992187
#line 2 "library/template/template.hpp"
#include <bits/stdc++.h>
#line 3 "library/template/macro.hpp"

#define all(x) std::begin(x), std::end(x)
#define rall(x) std::rbegin(x), std::rend(x)
#define elif else if
#define updiv(N, X) (((N) + (X) - (1)) / (X))
#define sigma(a, b) ((a + b) * (b - a + 1) / 2)
#define INT(...)     \
    int __VA_ARGS__; \
    scan(__VA_ARGS__)
#define LL(...)     \
    ll __VA_ARGS__; \
    scan(__VA_ARGS__)
#define STR(...)        \
    string __VA_ARGS__; \
    scan(__VA_ARGS__)
#define CHR(...)      \
    char __VA_ARGS__; \
    scan(__VA_ARGS__)
#define DOU(...)        \
    double __VA_ARGS__; \
    scan(__VA_ARGS__)
#define LD(...)     \
    ld __VA_ARGS__; \
    scan(__VA_ARGS__)
#define pb push_back
#define eb emplace_back
#line 3 "library/template/alias.hpp"

using ll = long long;
using ld = long double;
using pii = std::pair<int, int>;
using pll = std::pair<ll, ll>;
constexpr int inf = 1 << 30;
constexpr ll INF = 1LL << 60;
constexpr int dx[8] = {1, 0, -1, 0, 1, -1, 1, -1};
constexpr int dy[8] = {0, 1, 0, -1, 1, 1, -1, -1};
constexpr int mod = 998244353;
constexpr int MOD = 1e9 + 7;
#line 3 "library/template/func.hpp"

template <typename T>
inline bool chmax(T &a, T b) { return ((a < b) ? (a = b, true) : (false)); }
template <typename T>
inline bool chmin(T &a, T b) { return ((a > b) ? (a = b, true) : (false)); }
template <typename T, typename U>
std::ostream &operator<<(std::ostream &os, const std::pair<T, U> &p) {
    os << p.first << " " << p.second;
    return os;
}
template <typename T, typename U>
std::istream &operator>>(std::istream &is, std::pair<T, U> &p) {
    is >> p.first >> p.second;
    return is;
}
template <typename T>
std::ostream &operator<<(std::ostream &os, const std::vector<T> &v) {
    for (auto it = std::begin(v); it != std::end(v);) {
        os << *it << ((++it) != std::end(v) ? " " : "");
    }
    return os;
}
template <typename T>
std::istream &operator>>(std::istream &is, std::vector<T> &v) {
    for (T &in : v) {
        is >> in;
    }
    return is;
}
inline void scan() {}
template <class Head, class... Tail>
inline void scan(Head &head, Tail &...tail) {
    std::cin >> head;
    scan(tail...);
}
template <class T>
inline void print(const T &t) { std::cout << t << '\n'; }
template <class Head, class... Tail>
inline void print(const Head &head, const Tail &...tail) {
    std::cout << head << ' ';
    print(tail...);
}
template <class... T>
inline void fin(const T &...a) {
    print(a...);
    exit(0);
}
#line 3 "library/template/util.hpp"

struct IOSetup {
    IOSetup() {
        std::cin.tie(nullptr);
        std::ios::sync_with_stdio(false);
        std::cout.tie(0);
        std::cout << std::fixed << std::setprecision(12);
        std::cerr << std::fixed << std::setprecision(12);
    }
} IOSetup;
#line 3 "library/template/debug.hpp"

#ifdef LOCAL
#include <debug.hpp>
#else
#define debug(...)
#endif
#line 8 "library/template/template.hpp"
using namespace std;
#line 2 "B.cpp"

vector<ll> dijkstra(const vector<vector<pair<int, ll>>> &G, const int &s) {
    int N = G.size();
    vector<ll> dis(N, INF);
    priority_queue<pair<ll, int>, vector<pair<ll, int>>, greater<pair<ll, int>>> pq;
    dis[s] = 0;
    pq.emplace(dis[s], s);
    while (!pq.empty()) {
        pair<ll, int> p = pq.top();
        pq.pop();
        int v = p.second;
        for (auto &[to, cost] : G[v]) {
            if (dis[to] > dis[v] + cost) {
                dis[to] = dis[v] + cost;
                pq.emplace(dis[to], to);
            }
        }
    }
    return dis;
}
int main() {
    INT(N, M, L);
    LL(S, E);
    vector<vector<pair<int, ll>>> G(N);
    for (int i = 0; i < M; i++) {
        INT(a, b);
        a--, b--;
        LL(t);
        G[a].push_back({b, t});
        G[b].push_back({a, t});
    }
    vector<int> T(L);
    scan(T);
    auto dis1 = dijkstra(G, 0);
    auto dis2 = dijkstra(G, N - 1);
    if (dis1[N - 1] <= S) {
        fin(S+1);
    }
    ll ans = INF;
    for (int i = 0; i < L; i++) {
        int t = T[i] - 1;
        if (dis1[t] < S + E) {
            chmin(ans, max(dis1[t], S) + 1 + dis2[t]);
        }
    }
    print(ans == INF ? -1 : ans);
}