#include <fstream>
#define NMAX 999999999;
using namespace std;

ifstream fin("ubuntzei.in");
ofstream fout("ubuntzei.out");

int a[2001][2001],n,m,l,loc[16],s;

void initializare()
{
	int i,j;
	for(i=1; i<=n; i++)
		for(j=1; j<=n; j++)
			a[i][j]=NMAX;
	for(i=1;i<=n; i++)a[i][i]=0;
}

int main()
{
	int i,j,k,x,y,c,mini;
	fin>>n>>m>>l;
	for(i=1; i<=l; i++)fin>>loc[i];
	initializare();
	for(i=1; i<=m; i++)
	{
		fin>>x>>y>>c;
		a[x][y]=c;a[y][c]=c;
	}
	for(k=1;k<=n; k++)
		for(i=1;i<=n;i++)
			for(j=i+1;j<=n;j++)
				if(a[i][j]>a[i][k]+a[k][j])
				{
					a[i][j]=a[i][k]+a[k][j];
					a[j][i]=a[i][k]+a[k][j];
				}
	k=1;mini=NMAX;
	do{
		s=0;
		for(i=1; i<=l; i++)
		{
			s+=a[k][loc[i]];
			k=loc[i];
		}s+=a[k][n];
		if(s<mini)mini=s;
	}while(next_permutation(loc+1,loc+l+1));
	fout<<mini;
	return 0;
}