#include <fstream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <queue>
#define INF 2000000000

using namespace std;

int n, m, k;
int d[2012], dist[15][2012];
int best[15][(1<<15)];
// best[i][j] = costul minim de a ajunge in orasul i
//              si a vizita toate orasele din multimea j
int oras[20];

struct NOD
{
    int x, cost;
};

vector <NOD> a[2012];


inline void Read()
{
    ifstream f("ubuntzei.in");
    f>>n>>m>>k;
    int i;
    for (i=0; i<k; i++)
        f>>oras[i];
    NOD aux;
    int x, y, cost;
    for (i=0; i<m; i++)
    {
        f>>x>>y>>cost;
        aux.x = y;
        aux.cost = cost;
        a[x].push_back(aux);
        aux.x = x;
        a[y].push_back(aux);
    }
    f.close();
}

inline void BellmanFord(int nod, int v[])
{
    queue<int> Q;
    int i;
    vector<NOD>::iterator it, final;
    NOD aux;

    for (i=1; i<=n; i++)
        v[i] = INF;

    v[nod] = 0;
    Q.push(nod);

    int x, cost, y;

    while(!Q.empty())
    {
        x = Q.front();
        Q.pop();
        it = a[x].begin();
        final = a[x].end();
        for(; it!=final; it++)
        {
            aux = *it;
            y = aux.x;
            cost = aux.cost;
            if (v[y] > v[x] + cost)
            {
                v[y] = v[x] + cost;
                Q.push(y);
            }
        }
    }
}

inline void Solve()
{
    BellmanFord(1, d);
    if (k==0)
    {
        ofstream g("ubuntzei.out");
        g<<d[n]<<"\n";
        g.close();
        return ;
    }
    int i, j;
    for(i=0; i<k; i++)
        BellmanFord(oras[i], dist[i]);

    int nrmul = (1<<k) - 1, mul;
    bool ok;

    for (mul = 1; mul <= nrmul; mul++)
    {
        ok = false;
        for (i=0; i<k && !ok; i++)
        {
            if (mul == (1<<i))
            {
                ok = true;
                best[i][mul] = d[oras[i]];
            }
        }
        if (!ok)
        {
            // trebuie sa ajung in orasul i vizitand multimea mul
            for (i=0; i<k; i++)
            {
                best[i][mul] = INF;
                if ((mul&(1<<i)) != 0) // daca am orasul i in multime
                {
                    for (j=0; j<k; j++)
                    {
                        if (j!=i && (mul&(1<<j))!=0) // ajung in orasul i din orasul j vizitand multimea mul
                        {
                            best[i][mul] = min (best[i][mul], best[j][mul - (1<<i)] + dist[j][oras[i]]);
                        }
                    }
                }
            }
        }
    }
    int sol;
    sol = INF;
    for(i=0; i<k; i++)
    {
        sol = min(sol, best[i][nrmul] + dist[i][n]);
    }
    ofstream g("ubuntzei.out");
    g<<sol<<"\n";
    g.close();
}

int main()
{
    Read();
    Solve();
    return 0;
}