//ダイクストラ高速化弱め

#include <iostream>
#include <vector>
#include <queue>
#include <algorithm>
#define rep(i, l, n) for (int i = (l); i < (n); i++)
#define all(x) x.begin(), x.end()
using namespace std;
using Pair = pair<int, int>;
template <class T>
using V = vector<T>;
template <class T>
using VV = V<V<T> >;
const int inf = 2000000000;


int dijkstra(int n, int start, int finish, VV<Pair> &route) {
	V<int> path(n, -1);
	priority_queue<Pair, V<Pair>, greater<Pair> > pq;
	pq.push({ 0,start });
	while (pq.size()) {
		Pair p = pq.top();	pq.pop();
		int d = p.first;	int v = p.second;
		if (path[v] == -1) {
			path[v] = d;
			if (v == finish) {
				break;
			}
			rep(i, 0, route[v].size()) {
				Pair p = { d + route[v][i].second,route[v][i].first };
				pq.push(p);
			}
		}
	}
	return path[finish];
}


int main(void) {
	int N, M, K;	cin >> N >> M >> K;

	V<int> R(K);
	rep(i, 0, K) {
		cin >> R[i];	R[i] -= 1;
	}
	sort(all(R));

	VV<int> edge(M, V<int>(3));
	VV<Pair> route(N, V<Pair>(0));
	rep(i, 0, M) {
		rep(j, 0, 3) {
			cin >> edge[i][j];
		}
		edge[i][0] -= 1;	edge[i][1] -= 1;
		route[edge[i][0]].push_back({ edge[i][1],edge[i][2] });
		route[edge[i][1]].push_back({ edge[i][0],edge[i][2] });
	}

	int ans = inf;
	int rsum = 0;
	rep(i, 0, R.size()) {
		rsum += edge[R[i]][2];
	}
	VV<int> dist(N, V<int>(N));


	rep(rbit, 0, 1 << K) {
		V<int> b(K);
		rep(i, 0, K) {
			b[i] = (rbit >> i) & 1;
		}

		VV<int> dp(1 << K, V<int>(K, inf));
		rep(i, 0, K) {
			int p = edge[R[i]][b[i]];
			if (dist[0][p] == 0) {
				dist[0][p] = dist[p][0] = dijkstra(N, 0, p, route);
			}
			dp[1 << i][i] = dist[0][p] + rsum;
		}

		rep(bit, 1, 1 << K) {
			rep(s, 0, K) {
				int p = edge[R[s]][b[s] ^ 1];
				if (((bit >> s) & 1) == 0) {
					continue;
				}
				rep(t, 0, K) {
					int np = edge[R[t]][b[t]];
					int k = bit | (1 << t);
					if (dist[p][np] == 0) {
						dist[p][np] = dist[np][p] = dijkstra(N, p, np, route);
					}
					int d = dp[bit][s] + dist[p][np];
					if (((bit >> t) & 1) == 0 && dp[k][t] > d) {
						dp[k][t] = d;
					}
				}
			}
		}

		int c = inf;
		rep(i, 0, K) {
			int p = edge[R[i]][b[i] ^ 1];
			if (dist[p][N - 1] == 0) {
				dist[p][N - 1] = dist[N - 1][p] = dijkstra(N, p, N - 1, route);
			}
			int d = dp[(1 << K) - 1][i] + dist[p][N - 1];
			if (c > d) {
				c = d;
			}
		}

		if (ans > c) {
			ans = c;
		}
	}


	cout << ans << endl;
	return 0;
}