#include <iostream>
#include <string>
#include <algorithm> 
#include <vector>
#include <map>
#include <set>
#include <utility>
#include <queue>
#include <stack>
#include <cstring>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <iomanip>
#include <cassert>
#include <memory.h>
#include <functional>
#include <bitset>
#include <unordered_map>
#include <unordered_set>
#include <climits>


int main() {
    int n,m,l,s,e;
    std::cin >> n >> m >> l >> s >> e;
    using edge = std::pair<long long, int>;
    std::vector<std::vector<edge>> g(n);
    
    for (int i = 0; i < m; i++) {
        int u, v, w;
        std::cin >> u >> v >> w;
        u--,v--;
        g[u].emplace_back(v, w);
        g[v].emplace_back(u, w);
    }
    auto dij = [&](int start) -> std::vector<long long> {
        std::vector<long long> dist(n, 1e18);
        dist[start] = 0;
        std::priority_queue<edge, std::vector<edge>, std::greater<edge>> pq;
        pq.push({0, start});
        while (!pq.empty()) {
            auto [d, u] = pq.top();
            pq.pop();
            if (dist[u] != d) continue;
            for (auto [v, w] : g[u]) {
                if (dist[v] > dist[u] + w) {
                    dist[v] = dist[u] + w;
                    pq.push({dist[v], v});
                }
            }
        }
        return dist;
    };
    long long ans = 1e18;
    auto dist1 = dij(0);
    auto dist2 = dij(n - 1);
    for (int i = 0; i < l; i++) {
        int u;
        std::cin >> u;
        u--;
        if (dist1[u] <= s + e) {
            long long leave_time = dist1[u];
            if (dist1[u] < s) leave_time = s;
            ans = std::min(ans, leave_time  + 1 + dist2[u]);
        }
    }
    ans = ans == 1e18? -1:ans;
    std::cout << ans << '\n';
}