var     a:array[1..30000] of longint;
        b:array[0..120000] of longint;
        buf:array[1..1000000] of char;
        o:array[0..17] of longint;
        n,m,k,i,j:longint;
        L:int64;
        bo:boolean;
        f,g:text;

procedure verificare;
var     i:longint; x:int64;
begin
  x:=0;
  for i:=1 to k+1 do
    x:=x+b[(o[i]-1)*n+o[i+1]];
  if x<L then L:=x;
end;

procedure sw(var a,b:longint);
var     t:longint;
begin
  t:=a; a:=b; b:=t;
end;

procedure perm(p:longint);
var     i:longint;
begin
  if p>k then verificare else
    begin
      for i:=p to k do
        begin
          sw(o[i+1],o[p+1]);
          perm(p+1);
          sw(o[i],o[p+1]);
        end;
    end;
end;

begin
  assign(f,'ubuntzei.in');
  assign(g,'ubuntzei.out');
  reset(f);
  rewrite(g);
  settextbuf(f,buf);
  readln(f,n,m);
  read(f,k);
  o[1]:=1;
  o[k+2]:=n;
  for i:=2 to k+1 do
    read(f,o[i]);
  for i:=1 to m do
    readln(f,a[(i-1)*3+1],a[(i-1)*3+2],a[(i-1)*3+3]);

  for i:=1 to k+1 do
  for j:=1 to n do
    b[(i-1)*n+j]:=-1;

  for i:=1 to k+1 do
    begin
      b[(i-1)*n+o[i]]:=0;
      bo:=true;
      while bo do
        begin
          bo:=false;
          for j:=1 to m do
            begin
              if ((b[(i-1)*n+a[(j-1)*3+1]]>-1)and((b[(i-1)*n+a[(j-1)*3+2]]=-1)or(b[(i-1)*n+a[(j-1)*3+2]]>b[(i-1)*n+a[(j-1)*3+1]]+a[(j-1)*3+3]))) then
                begin
                  b[(i-1)*n+a[(j-1)*3+2]]:=b[(i-1)*n+a[(j-1)*3+1]]+a[(j-1)*3+3];
                  bo:=true;
                end;
              if ((b[(i-1)*n+a[(j-1)*3+2]]>-1)and((b[(i-1)*n+a[(j-1)*3+1]]=-1)or(b[(i-1)*n+a[(j-1)*3+1]]>b[(i-1)*n+a[(j-1)*3+2]]+a[(j-1)*3+3]))) then
                begin
                  b[(i-1)*n+a[(j-1)*3+1]]:=b[(i-1)*n+a[(j-1)*3+2]]+a[(j-1)*3+3];
                  bo:=true;
                end;
            end;
        end;
    end;

  L:=2000000000;
  perm(1);
  writeln(g,L);
  close(g);
end.