// Warshall-Floyd

#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 = 1000000000;


void warshall_floyd(int N, VV<int>&dist) {
	rep(i, 0, N) {
		dist[i][i] = 0;
	}
	rep(k, 0, N) {
		rep(i, 0, N) {
			rep(j, 0, N) {
				int d = dist[i][k] + dist[k][j];
				if (dist[i][j] > d) {
					dist[i][j] = d;
				}
			}
		}
	}
}


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<int> dist(N, V<int>(N, inf));
	rep(i, 0, M) {
		rep(j, 0, 3) {
			cin >> edge[i][j];
		}
		edge[i][0] -= 1;	edge[i][1] -= 1;
		int a = edge[i][0];	int b = edge[i][1];
		dist[a][b] = dist[b][a] = edge[i][2];
	}
	warshall_floyd(N, dist);

	int ans = inf;
	int rsum = 0;
	rep(i, 0, R.size()) {
		rsum += edge[R[i]][2];
	}


	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]];
			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);
					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];
			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;
}