#include <bits/stdc++.h>
#define int long long int
#define mod(x) ((x % MOD) + MOD) % MOD
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define FORE(i,a,b) for(int i=(a);i<=(b);++i)
#define RFOR(i,a,b) for(int i=(b)-1;i>=(a);--i)
#define RFORE(i,a,b) for(int i=(b);i>=(a);--i)
#define REP(i,n) FOR(i,0,n)
#define ALL(c) (c).begin(),(c).end()
#define RALL(c) (c).rbegin(),(c).rend()
#define SORT(c) sort(ALL(c))
#define RSORT(c) sort(RALL(c))
#define SZ(c) (int)((c).size())
#define EACH(i,c) for(typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i)
#define LB(c,x) (int)(lower_bound(ALL(c),x)-(c).begin())
#define UB(c,x) (int)(upper_bound(ALL(c),x)-(c).begin())
#define COUNT(c,x) (UB(c,x)-LB(c,x))
#define UNIQUE(c) SORT(c); (c).erase(unique(ALL(c)),(c).end());
#define COPY(c1,c2) copy(ALL(c1),(c2).begin())
#define EXIST(s,e) (bool)((s).find(e)!=(s).end())
#define PB push_back
#define MP make_pair
#define DEL(v) decltype(v)().swap(v)
#define DUMP(x)  cerr << #x << " = " << (x) << endl;
#define NL cerr << endl;
#define chmax(a, b) a=(((a)<(b))?(b):(a))
#define chmin(a, b) a=(((a)>(b))?(b):(a))
#define F first
#define S second
using namespace std;
template<typename T1, typename T2> using P = pair<T1,T2>;
template<typename T> using V = vector<T>;
struct edge { int from, to; int cost; };
bool operator< (const edge &edge1, const edge &edge2) { return edge1.cost < edge2.cost; };
const int INF = 1e18;
const int MOD = 1e9+7;

template<typename T> ostream& operator << (ostream& s, const V<T>& v) {
   s << "[";
   for (int i = 0; i < v.size(); i++) { s << v[i]; if (i < v.size() - 1) s << " "; }
   s << "]";
   return s;
}
template<typename T1, typename T2> ostream& operator << (ostream& s, const P<T1,T2>& p) {
   s << "(" << p.first << "," << p.second << ")";
   return s;
}
template<typename T> ostream& operator << (ostream& s, const set<T>& st) {
   s << "{";
   for (auto i = st.begin(); i != st.end(); ++i) {
      s << *i;
      if (next(i) != st.end()) s << ", ";
   }
   s << "}";
   return s;
}
template<typename T1, typename T2> ostream& operator << (ostream& s, const map<T1,T2>& m) {
   s << "{";
   for (auto i = m.begin(); i != m.end(); ++i) {
      s << i->first << ":" << i->second;
      if (next(i) != m.end()) s << ", ";
   }
   s << "}";
   return s;
}

template<typename T>
void warshall_floyd(vector< vector<T> >& d)
{
   int N = d.size();
   for (int k = 0; k < N; k++) {
      for (int i = 0; i < N; i++) {
         for (int j = 0; j < N; j++) {
            d[i][j] = min(d[i][j], d[i][k] + d[k][j]);
         }
      }
   }
}

signed main()
{
   int N, M, R; cin >> N >> M >> R;

   V<int> r(R+2);
   REP(i, R) {
      cin >> r[i]; --r[i];
   }
   r[R] = N; r[R+1] = N+1;

   V<V<int>> d(N+2, V<int>(N+2, INF));
   REP(i, M) {
      int a, b, c; cin >> a >> b >> c; --a; --b;
      d[a][b] = c; d[b][a] = c;
   }
   REP(i, N+2) {
      d[i][i] = 0;
      d[N][i] = 0; d[i][N+1] = 0;
   }
   d[N][N+1] = INF;

   warshall_floyd(d);

   V<V<int>> dp(1<<(R+2), V<int>(R+2, INF));
   // dp[s][i]: the minimum cost to visit all vertex in s, start from N(=r[R]) to r[i]
   dp[1<<R][R] = 0;
   REP(s, 1<<(R+2)) {
      REP(i, R+2) {
         REP(j, R+2) {
            if ((s >> j & 1) == 0) {
               // if j is not in s,
               chmin(dp[s | (1<<j)][j], dp[s][i] + d[r[i]][r[j]]);
            }
         }
      }
   }
   int ans = dp[(1<<(R+2))-1][R+1];
   cout << ans << endl;

   return 0;
}


Measured memory_bytes: 640