// bitDP なし

#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;


VV<int> dijkstra(int n, VV<int>&edge, V<int>&R, VV<Pair>&route) {
	VV<int> dist(n, V<int>(n, -1));
	V<int> st = { 0,n - 1 };
	rep(i, 0, R.size()) {
		st.push_back(edge[R[i]][0]);
		st.push_back(edge[R[i]][1]);
	}
	rep(i, 0, st.size()) {
		int k = st[i];
		priority_queue<Pair, V<Pair>, greater<Pair> > pq;
		pq.push({ 0,k });
		int cnt = 0;
		while (pq.size() && cnt < n) {
			Pair p = pq.top();	pq.pop();
			int d = p.first;	int v = p.second;
			if (dist[k][v] == -1) {
				cnt++;
				dist[k][v] = d;
				rep(j, 0, route[v].size()) {
					Pair p = { d + route[v][j].second,route[v][j].first };
					pq.push(p);
				}
			}
		}
	}
	return dist;
}


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;
	}

	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 = dijkstra(N, edge, R, route);

	do {
		rep(bit, 0, 1 << K) {
			int s = rsum;
			V<int> path(1);
			rep(i, 0, K) {
				int b = (bit >> i) & 1;
				path.push_back(edge[R[i]][b]);
				path.push_back(edge[R[i]][b ^ 1]);
			}
			path.push_back(N - 1);
			for (int i = 0; i < path.size() - 1; i += 2) {
				s += dist[path[i]][path[i + 1]];
			}
			if (ans > s) {
				ans = s;
			}
		}
	} while (next_permutation(all(R)));

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