#define TEST_MODE true

#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES

#include "bits/stdc++.h"
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define rep2(i, a, b) for (int i = (a); i < (int)(b); ++i)
#define rrep(i, n) for (int i = (n)-1; i >= 0; --i)
#define rrep2(i, a, b) for (int i = (a)-1; i >= (int)b; --i)
#define range(i, a, b, c) for (int i = a;             \
                                   c > 0 ? i < b : i > b; \
                                   i += c)
#define chmax(a, b) (a = (a) < (b) ? (b) : (a))
#define chmin(a, b) (a = (a) > (b) ? (b) : (a))
using ll = long long;
using ull = unsigned long long;
using ld = long double;
#define all(a) begin(a), end(a)
#define ifnot(a) if (not(a))
#define int long long

#ifdef LOCAL_ENV

#if TEST_MODE == true
const bool test = true;
#define dump(x) cerr << #x << " = " << (x) << " "
#define dumpl(x) dump(x) << endl
#else
const bool test = false;
#define dump(x) 
#define dumpl(x)
#endif

#else
const bool test = false;
#define dump(x) 
#define dumpl(x)
#endif

int dx[] = { 1, 0, -1, 0 };
int dy[] = { 0, 1, 0, -1 };
const int INF = (int)1 << 60;
const ll INFL = (ll)1 << 60;
ll mod_n = (int)1e9 + 7;
const double eps = 1e-10;
typedef long double Real;
// return -1, 0, 1
int sgn(const Real &r) { return (r > eps) - (r < -eps); }
int sgn(const Real &a, const Real &b) { return sgn(a - b); }

//.....................
const int MAX = (int)2e5 + 5;

vector<string> split(const string &str, char sep)
{
	vector<string> v;
	stringstream ss(str);
	string buffer;
	while (getline(ss, buffer, sep))
	{
		v.push_back(buffer);
	}
	return v;
}

template <class InputIterator>
int sum(InputIterator begin, InputIterator end)
{
	return accumulate(begin, end, 0ll);
}

template<typename T>
T gcd(T a, T b)
{
	T c;
	while (a != 0) {
		c = a; a = b%a;  b = c;
	}
	return b;
}

template<typename T>
T bit_count(T N) {
	T cnt = 0;
	while (N) {
		if (N & 1) cnt++;
		N >>= 1;
	}
	return cnt;
}

template<typename T>
void print_vec(ostream& ostream, vector<T> a) {
	rep(i, a.size() - 1) ostream << a[i] << " ";
	ostream << a.back() << endl;
}

struct Point {
	int y, x;
	bool operator < (const Point& r) {
		if (x < r.x) return true;
		else return false;
	}
};

class Solver {
public:
	int H, W;
	int N, M, R;
	vector<int> r;

	struct Vertex {
		int id, dist, mask;
		bool operator > (const Vertex& r) const {
			return dist > r.dist;
		}
	};

	struct Edge {
		int to, weight;
		Edge(int to, int weight) : to(to), weight(weight) {};
	};

	using Graph = vector<vector<Edge>>;

	using Weight = int;

	Graph g;
	int r_rev[205];
	int d[205][1 << 9];
	int start_id, goal_id;

	int dijkstra(int start_id) {
		rep(i, 205) rep(j, 1 << 9) {
			d[i][j] = INF;
		}
		priority_queue<Vertex, vector<Vertex>, greater<Vertex>> q;
		Vertex start;
		start.id = start_id;
		start.dist = 0;
		{
			int id = r_rev[start_id];
			if (id != -1) {
				d[start_id][1 << id] = 0;
				start.mask = 1 << id;
			}
		}
		for (q.push(start); !q.empty(); ) {
			Vertex p = q.top(); q.pop();
			for (auto f : g[p.id]) {
				Vertex next_p;
				next_p.id = f.to;
				next_p.dist = p.dist + f.weight;
				next_p.mask = p.mask;
				{
					int id = r_rev[f.to];
					if (id != -1) next_p.mask |= 1 << id;
				}
				if (d[next_p.id][next_p.mask] > next_p.dist) {
					d[next_p.id][next_p.mask] = next_p.dist;
					q.push(next_p);
				}
			}
		}
		//rep(i, N) rep(mask, 1 << R) {
		//	cerr << i << " " << std::bitset<3>(mask) 
		//		<< " "<< d[i][mask] << endl;
		//}
		int ans = INF;
		rep(i, R) {
			chmin(ans, d[r[i]][(1 << R) - 1]);
		}
		return ans;
	}

	bool grid_ok(int y, int x) {
		return 0 <= y && y < H && 0 <= x && x < W;
	}

	void solve() {
		cin >> N >> M >> R;
		r.resize(R);
		rep(i, N) {
			r_rev[i] = -1;
		}
		rep(i, R) {
			cin >> r[i];
			r[i]--;
			r_rev[r[i]] = i;
		}
		g.resize(N);
		rep(i, M) {
			int a, b, c;
			cin >> a >> b >> c;
			a--; b--;
			g[a].push_back(Edge(b, c));
			g[b].push_back(Edge(a, c));
		}

		int ans = INF;
		rep(i, R) {
			int ret = dijkstra(r[i]);
			chmin(ans, ret);
		}
		cout << ans << endl;
	}

};

signed main()
{
	srand((unsigned int)time(NULL));
	cout << fixed << setprecision(20);
	auto ptr = new Solver();
	ptr->solve();
	delete ptr;
	//while (true) {
	//	if (cin.eof() == true) break;
	//	auto ptr = new Solver();
	//	ptr->solve();
	//	delete ptr;
	//}
	return 0;
}


Measured memory_bytes: 7724