using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using static System.Console;
using Pair = System.Collections.Generic.KeyValuePair<int, int>;
//using System.Numerics;
//using static System.Math;

class Program
{
    static void Main()
    {
        //SetOut(new StreamWriter(OpenStandardOutput()) { AutoFlush = false });
        new Program().solve();
        Out.Flush();
    }
    Scanner cin = new Scanner();
    readonly int[] dd = { 0, 1, 0, -1, 0 };
    readonly int mod = 1000000007;
    readonly string alfa = "abcdefghijklmnopqrstuvwxyz";
    readonly string ALFA = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    int N;
    void solve()
    {
        N = cin.nextint;
        int M = cin.nextint;
        int R = cin.nextint;
        var r = cin.scanint.Select(i => i - 1).ToArray();
        input(N, M);
        warshall_floyd(N);
        var id = Enumerable.Range(0, R).ToArray();
        long ans = long.MaxValue;
        do
        {
            long t = 0;
            for (int i = 0; i < R - 1; i++)
            {
                t += D[r[id[i]], r[id[i + 1]]];
            }
            ans = Math.Min(t, ans);
        } while (next_permutation(id));
        WriteLine(ans);
    }

    bool next_permutation<T>(T[] array) where T : IComparable<T>
    {
        return next_permutation(array, 0, array.Length);
    }
    bool next_permutation<T>(T[] array, int start, int length) where T : IComparable<T>
    {
        int end = start + length - 1;
        if (end <= start) return false;
        int last = end;
        while (true)
        {
            int pos = last--;
            if (array[last].CompareTo(array[pos]) < 0)
            {
                int i;
                for (i = end + 1; array[last].CompareTo(array[--i]) >= 0;) { }
                T tmp = array[last]; array[last] = array[i]; array[i] = tmp;
                Array.Reverse(array, pos, end - pos + 1);
                return true;
            }
            if (last == start)
            {
                //Array.Reverse(array, start, end - start + 1);
                return false;
            }
        }
    }
    long[,] D;
    const long inf = long.MaxValue / 3;
    void input(int n, int m)
    {
        D = new long[n, n];
        for (int i = 0; i < n; i++)
        {
            for (int j = 0; j < n; j++)
            {
                D[i, j] = inf;
                if (i == j) D[i, j] = 0;
            }
        }
        for (int i = 0; i < m; i++)
        {
            int a = cin.nextint - 1;
            int b = cin.nextint - 1;
            long c = cin.nextint;
            D[a, b] = Math.Min(D[a, b], c);
            D[b, a] = D[a, b];
        }       
    }
    void warshall_floyd(int n)
    {
        for (int k = 0; k < n; k++)
        {
            for (int i = 0; i < n; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    D[i, j] = Math.Min(D[i, j], D[i, k] + D[k, j]);
                }
            }
        }
    }
}

class Scanner
{
    string[] s; int i;
    char[] cs = new char[] { ' ' };
    public Scanner() { s = new string[0]; i = 0; }
    public string[] scan { get { return ReadLine().Split(); } }
    public int[] scanint { get { return Array.ConvertAll(scan, int.Parse); } }
    public long[] scanlong { get { return Array.ConvertAll(scan, long.Parse); } }
    public double[] scandouble { get { return Array.ConvertAll(scan, double.Parse); } }
    public string next
    {
        get
        {
            if (i < s.Length) return s[i++];
            string st = ReadLine();
            while (st == "") st = ReadLine();
            s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
            i = 0;
            return next;
        }
    }
    public int nextint { get { return int.Parse(next); } }
    public long nextlong { get { return long.Parse(next); } }
    public double nextdouble { get { return double.Parse(next); } }
}

Measured memory_bytes: 17548