using System;
using System.Text;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using static System.Console;
using static System.Math;

namespace AtCorder
{
    class Program
    {
        static void Main(string[] args)
        {
            new Program().Solve(new ConsoleInput(Console.In, ' '));
        }


        public void Solve(ConsoleInput cin)
        {
            var N = cin.ReadInt;
            var M = cin.ReadInt;
            var R = cin.ReadInt;
            var r = cin.ReadIntArray(R);
            var map = new int[N, N];
            for (int i = 0; i < M; i++)
            {
                var A = cin.ReadInt;
                var B = cin.ReadInt;
                var C = cin.ReadInt;
                map[A - 1, B - 1] = C;
                map[B - 1, A - 1] = C;
            }
            var d = new int[N, N];


            for (int i = 1; i <= N; i++)
            {
                for (int j = 1; j <= N; j++)
                {
                    d[i - 1, j - 1] = 20000000;
                    if (map[i - 1, j - 1] != 0)
                        d[i - 1, j - 1] = map[i - 1, j - 1];
                }
            }

            for(int k = 1; k <= N; k++)
            {
                for(int i = 1; i <= N; i++)
                {
                    for(int j = 1; j <= N; j++)
                    {
                        if (d[i - 1, j - 1] > d[i - 1, k - 1] + d[k - 1, j - 1])
                            d[i - 1, j - 1] = d[i - 1, k - 1] + d[k - 1, j - 1];
                    }
                }
            }
            var perm = new Permutation();
            var ary = perm.Enumerate(r).ToArray();
            var ans = long.MaxValue;
            foreach(var n in ary)
            {
                var tmp = 0L;
                var now = n[0];
                for(int i = 1; i < R; i++)
                {
                    tmp += d[now - 1, n[i] - 1];
                    now = n[i];
                }
                if (ans > tmp) ans = tmp;
            }
            WriteLine(ans);
        }
        public class Permutation
        {
            public IEnumerable<T[]> Enumerate<T>(IEnumerable<T> items)
            {
                return _GetPermutations<T>(new List<T>(), items.ToList());
            }

            private IEnumerable<T[]> _GetPermutations<T>(IEnumerable<T> perm, IEnumerable<T> items)
            {
                if (items.Count() == 0)
                {
                    yield return perm.ToArray();
                }
                else
                {
                    foreach (var item in items)
                    {
                        var result = _GetPermutations<T>(perm.Concat(new T[] { item }),
                                                            items.Where(x => x.Equals(item) == false)
                                        );
                        foreach (var xs in result)
                            yield return xs.ToArray();
                    }
                }
            }
        }

        public class ConsoleInput
        {
            private readonly System.IO.TextReader _stream;
            private char _separator = ' ';
            private Queue<string> inputStream;
            public ConsoleInput(System.IO.TextReader stream, char separator = ' ')
            {
                this._separator = separator;
                this._stream = stream;
                inputStream = new Queue<string>();
            }
            public string Read
            {
                get
                {
                    if (inputStream.Count != 0) return inputStream.Dequeue();
                    string[] tmp = _stream.ReadLine().Split(_separator);
                    for (int i = 0; i < tmp.Length; ++i)
                        inputStream.Enqueue(tmp[i]);
                    return inputStream.Dequeue();
                }
            }
            public string ReadLine { get { return _stream.ReadLine(); } }
            public int ReadInt { get { return int.Parse(Read); } }
            public long ReadLong { get { return long.Parse(Read); } }
            public double ReadDouble { get { return double.Parse(Read); } }
            public string[] ReadStrArray(long N) { var ret = new string[N]; for (long i = 0; i < N; ++i) ret[i] = Read; return ret; }
            public int[] ReadIntArray(long N) { var ret = new int[N]; for (long i = 0; i < N; ++i) ret[i] = ReadInt; return ret; }
            public long[] ReadLongArray(long N) { var ret = new long[N]; for (long i = 0; i < N; ++i) ret[i] = ReadLong; return ret; }
        }
    }
}


Measured memory_bytes: 25052