#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long int ll;
typedef long double ld;
#define FOR(i,l,r) for(ll i=l;i<r;i++)
#define REP(i,n) FOR(i,0,n)
#define RFOR(i,l,r) for(ll i=r-1;i>=l;i--)
#define RREP(i,n) RFOR(i,0,n)
#define ALL(x) x.begin(),x.end()
#define PA pair<ll,ll>
#define F first
#define S second
#define BS(A,x) binary_search(ALL(A),x)
#define LB(A,x) (ll)(lower_bound(ALL(A),x)-A.begin())
#define UB(A,x) (ll)(upper_bound(ALL(A),x)-A.begin())
#define COU(A,x) (UB(A,x)-LB(A,x))
#define sz(c) ((ll)(c).size())
/*
#include<boost/multiprecision/cpp_int.hpp>
namespace mp=boost::multiprecision;
using Bint=mp::cpp_int;
*/
template<typename T>using min_priority_queue=priority_queue<T,vector<T>,greater<T>>;
template<typename T1,typename T2>ostream&operator<<(ostream&os,pair<T1,T2>&p){os<<p.F<<" "<<p.S;return os;}
template<typename T1,typename T2>istream&operator>>(istream&is,pair<T1,T2>&p){is>>p.F>>p.S;return is;}
template<typename T>ostream&operator<<(ostream&os,vector<T>&v){REP(i,sz(v))os<<v[i]<<(i+1!=sz(v)?" ":"");return os;}
template<typename T>istream&operator>>(istream&is,vector<T>&v){for(T&in:v)is>>in;return is;}
template<class T>bool chmax(T&a,T b){if(a<b){a=b;return 1;}return 0;}
template<class T>bool chmin(T&a,T b){if(b<a){a=b;return 1;}return 0;}
ld dist(ld x1,ld y1,ld x2,ld y2){return sqrtl((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));}
using mint=modint1000000007;
//using mint=modint998244353;
const ll mod=1000000007;
//const ll mod=998244353;
//using mint=modint;
ostream&operator<<(ostream&os,mint&a){os<<a.val();return os;}

vector<ll>fast_mod_convolution(vector<ll>&a,vector<ll>&b,ll mod){
  const ll m1=167772161,m2=469762049,m3=1224736769;
  const ll m1_inv_m2=inv_mod(m1,m2);
  const ll m12_inv_m3=inv_mod(m1*m2,m3);
  const ll m12_mod=m1*m2%mod;
  auto x=convolution<m1>(a,b);
  auto y=convolution<m2>(a,b);
  auto z=convolution<m3>(a,b);
  vector<ll>ret(sz(a)+1);
  REP(i,sz(a)+1){
    ll v1=(y[i]-x[i])*m1_inv_m2%m2;if(v1<0)v1+=m2;
    ll v2=(z[i]-(x[i]+m1*v1)%m3)*m12_inv_m3%m3;if(v2<0)v2+=m3;
	ret[i]=(x[i]+m1*v1+m12_mod*v2)%mod;
  }
  return ret;
}

int main(){
  ll N,M,K;cin>>N>>M>>K;
  vector<ll>R(K),U(M),V(M);cin>>R;
  REP(i,K)R[i]--;sort(ALL(R));
  vector<vector<PA>>E(N);
  ll S=0;
  REP(i,M){
    ll A,B,C;cin>>A>>B>>C;A--;B--;
    E[A].emplace_back(PA(B,C));
    E[B].emplace_back(PA(A,C));
    U[i]=A;V[i]=B;if(COU(R,i))S+=C;
  }
  vector<vector<ll>>D(N);
  REP(_,2*K+2){
    ll i;
    if(_<2*K){if(_%2)i=U[R[_/2]];else i=V[R[_/2]];}
    else if(_==2*K)i=0;else i=N-1;
    D[i].resize(N);
    REP(j,N)D[i][j]=1e18;
    D[i][i]=0;
    min_priority_queue<PA>Q;
    Q.emplace(PA(0,i));
    while(sz(Q)){
      ll t=Q.top().F,v=Q.top().S;Q.pop();
      if(D[i][v]!=t)continue;
      for(auto[u,c]:E[v])if(chmin(D[i][u],D[i][v]+c))Q.emplace(PA(D[i][u],u));
    }
  }
  vector<vector<ll>>X(K,vector<ll>(1<<K,1e18)),Y(K,vector<ll>(1<<K,1e18));
  REP(i,K)X[i][1<<i]=D[0][U[R[i]]];
  REP(i,K)Y[i][1<<i]=D[0][V[R[i]]];
  REP(i,1<<K){
    REP(j,K)if((i>>j)%2){
      REP(k,K)if(j!=k&&(i>>k)%2){
        chmin(X[j][i],X[k][i^(1<<j)]+D[V[R[k]]][U[R[j]]]);
        chmin(X[j][i],Y[k][i^(1<<j)]+D[U[R[k]]][U[R[j]]]);
        chmin(Y[j][i],X[k][i^(1<<j)]+D[V[R[k]]][V[R[j]]]);
        chmin(Y[j][i],Y[k][i^(1<<j)]+D[U[R[k]]][V[R[j]]]);
      }
    }
  }
  ll ans=1e18;
  REP(i,K)chmin(ans,X[i].back()+D[V[R[i]]][N-1]);
  REP(i,K)chmin(ans,Y[i].back()+D[U[R[i]]][N-1]);
  cout<<ans+S<<endl;
  return 0;
}