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#include<fstream>
#include<algorithm>
#define M 2000000000
using namespace std;
ifstream f("ubuntzei.in");
ofstream g("ubuntzei.out");
struct nod
{
int inf;
int c;
nod * leg;
};
typedef nod* PNod;
PNod L[2001];
int q[800000],cost[2001],n,m,x,y,s,v[16],a[2001][2001],cmin=M,k;
int sol[2001];
void add(int a,int b,int costi)
{
PNod p=new nod;
p->inf=b;
p->c=costi;
p->leg=L[a];
L[a]=p;
}
void bellford(int poz)
{ int i;
q[1]=poz;
for(i=1;i<=n;i++)
cost[i]=M;
cost[poz]=0;
int inc=1,sf=1,ok=0;
while(inc<=sf&&ok==0)
{
for(PNod p=L[q[inc]];p;p=p->leg)
if(cost[p->inf]>cost[q[inc]]+p->c)
{
cost[p->inf]=cost[q[inc]]+p->c;
sf++;
q[sf]=p->inf;
}
inc++;
}
}
int viz[2001],x1[2001];
void verif()
{
int s=0,i;
s+=a[1][v[sol[1]]];
for(i=2;i<=k;i++)
s+=a[v[sol[i-1]]][v[sol[i]]];
cmin=min(cmin,s+a[v[sol[k]]][n]);
}
int main()
{
int a1,b,costi,i;
f>>n>>m;
f>>k;
for(i=1;i<=k;i++)
f>>v[i];
for(i=1;i<=m;i++)
{
f>>a1>>b>>costi;
add(a1,b,costi);add(b,a1,costi);
}
if(k==0){ bellford(1);g<<cost[n];return 0;}
if(k==1){bellford(1);s+=cost[v[1]];bellford(v[1]);s+=cost[n];g<<s;return 0;}
bellford(1);
for(i=1;i<=n;i++){
a[1][i]=cost[i];
}
a[1][1]=M;
for(i=1;i<=k;i++)
{
bellford(v[i]);
for(int i1=1;i1<=n;i1++)
{
a[v[i]][i1]=cost[i1];
}
a[v[i]][v[i]]=M;
}
for(i=1;i<=k;i++)sol[i]=i;
do
{
verif();
}while(next_permutation(sol+1,sol+k+1));
g<<cmin;
return 0;
}