using System;
using System.Collections.Generic;
using System.Linq;
using BitArray = System.Collections.BitArray;
using BigInteger = System.Numerics.BigInteger;
using TextReader = System.IO.TextReader;
using System.Text;

namespace AtCoderProject
{
    public class Program
    {
        public object Calc()
        {
            N = consoleReader.Int;
            M = consoleReader.Int;
            R = consoleReader.Int;
            r = consoleReader.Split.Int0;

            distances = new int[N, N];
            for (int i = 0; i < N; i++)
                for (int j = 0; j < N; j++)
                    if (i != j)
                        distances[i, j] = int.MaxValue / 2;

            var gb = new LengthGraphBuilder(N);
            foreach (var cr in consoleReader.Repeat(M))
            {
                int x = cr.Int - 1, y = cr.Int - 1;
                var d = cr.Int;
                gb.Add(x, y, d);
                distances[x, y] = distances[y, x] = d;
            }
            graph = gb.ToArray();

            for (int k = 0; k < N; k++)
                for (int i = 0; i < N; i++)
                    for (int j = 0; j < N; j++)
                    {
                        var d = distances[i, k] + distances[k, j];
                        if (d < distances[i, j])
                            distances[i, j] = distances[j, i] = d;
                    }


            var min = int.MaxValue;
            foreach (var p in Permutation(r, Array.Empty<int>()))
            {
                var d = 0;
                for (int i = 1; i < p.Length; i++)
                    d += distances[p[i - 1], p[i]];
                min = Math.Min(d, min);
            }
            return min;
        }
        IEnumerable<int[]> Permutation(int[] unused, int[] current)
        {
            if (unused.Length == 0)
                yield return current;
            else
            {
                var nextUnUsed = new int[unused.Length - 1];
                Array.Copy(unused, 1, nextUnUsed, 0, nextUnUsed.Length);
                for (int i = 0; i < unused.Length; i++)
                {
                    var next = new int[current.Length + 1];
                    current.CopyTo(next, 0);
                    next[next.Length - 1] = unused[i];
                    foreach (var item in Permutation(nextUnUsed, next))
                        yield return item;

                    if (i < nextUnUsed.Length)
                        nextUnUsed[i] = unused[i];
                }
            }
        }
        void InitDistance(int root, int from, int distance)
        {
            foreach (var next in graph[from])
            {
                var nextDistance = distance + next.length;
                if (distances[root, next.to] > nextDistance)
                {
                    distances[root, next.to] = distances[next.to, root] = nextDistance;
                    InitDistance(root, next.to, nextDistance);
                }
            }
        }
        int N;
        int M;
        int R;
        int[] r;
        Next[][] graph;
        int[,] distances;
        struct Next
        {
            public int to;
            public int length;
        }
        class LengthGraphBuilder
        {
            public List<Next>[] lists;
            public LengthGraphBuilder(int count)
            {
                this.lists = new List<Next>[count];
                for (int i = 0; i < count; i++)
                    this.lists[i] = new List<Next>();
            }
            public LengthGraphBuilder(int count, IEnumerable<int[]> arrays) : this(count)
            {
                foreach (var item in arrays)
                    this.Add(item[0], item[1], item[2]);
            }
            public void Add(int from, int to, int length)
            {
                this.lists[from].Add(new Next { to = to, length = length });
                this.lists[to].Add(new Next { to = from, length = length }); // 有向の場合は消す
            }
            public Next[][] ToArray()
            {
                var N = this.lists.Length;
                var res = new Next[N][];
                for (int i = 0; i < N; i++)
                    res[i] = this.lists[i].ToArray();
                return res;
            }
        }

        #region いつもの
#pragma warning disable
        private ConsoleReader consoleReader;
        public Program(ConsoleReader consoleReader) { this.consoleReader = consoleReader; }
        static void Main() => Console.WriteLine(new Program(new ConsoleReader(Console.In)).Calc()); static string AllLines<T>(IEnumerable<T> source) => string.Join("\n", source);
    }
    static class Ext
    {
        public static Dictionary<TKey, int> GroupCount<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector) => source.GroupBy(keySelector).ToDictionary(g => g.Key, g => g.Count());
        public static Dictionary<TKey, int> GroupCount<TKey>(this IEnumerable<TKey> source) => source.GroupCount(i => i);
    }
    public class ConsoleReader { private string[] ReadLineSplit() => textReader.ReadLine().Split(Array.Empty<char>(), StringSplitOptions.RemoveEmptyEntries); private string[] line = Array.Empty<string>(); private int linePosition; private TextReader textReader; public ConsoleReader(TextReader tr) { textReader = tr; } public int Int => int.Parse(String); public long Long => long.Parse(String); public double Double => double.Parse(String); public string String { get { if (linePosition >= line.Length) { linePosition = 0; line = ReadLineSplit(); } return line[linePosition++]; } } public class SplitLine { private string[] splited; public SplitLine(ConsoleReader cr) { splited = cr.ReadLineSplit(); cr.line = Array.Empty<string>(); } public int[] Int => String.Select(x => int.Parse(x)).ToArray(); public int[] Int0 => String.Select(x => int.Parse(x) - 1).ToArray(); public long[] Long => String.Select(x => long.Parse(x)).ToArray(); public double[] Double => String.Select(x => double.Parse(x)).ToArray(); public string[] String => splited; } public SplitLine Split => new SplitLine(this); public class RepeatReader : IEnumerable<ConsoleReader> { ConsoleReader cr; int count; public RepeatReader(ConsoleReader cr, int count) { this.cr = cr; this.count = count; } public IEnumerator<ConsoleReader> GetEnumerator() => Enumerable.Repeat(cr, count).GetEnumerator(); System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() => GetEnumerator(); public IEnumerable<string> String => this.Select(cr => cr.String); public IEnumerable<int> Int => this.Select(cr => cr.Int); public IEnumerable<int> Int0 => this.Select(cr => cr.Int - 1); public IEnumerable<long> Long => this.Select(cr => cr.Long); public IEnumerable<double> Double => this.Select(cr => cr.Double); } public RepeatReader Repeat(int count) => new RepeatReader(this, count); }
    #endregion
}

Measured memory_bytes: 18708