/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author cteam042
 */
import java.util.Scanner;

public class invasion {

    public static class G
    {
        public static int nodes;
        public static int roads;
        public static int bases;
        public static int distance;
        public static int[][] graph;
        public static int[] aliensLocation;
        public static boolean[] safe;
    }
    
    static Scanner scanner;
    
    public static void main(String[] args)
    {
        scanner = new Scanner(System.in);
        while(1==1)
        {
            String line = scanner.nextLine();
            if (line.equals("0 0 0 0"))
                break;
            if (line.equals(""))
               continue;
            
            String[] parts = line.split(" ");
            G.nodes = Integer.parseInt(parts[0]);
            G.roads = Integer.parseInt(parts[1]);
            G.bases = Integer.parseInt(parts[2]);
            G.distance = Integer.parseInt(parts[3]);
            
            G.graph = new int[G.nodes][G.nodes];
            
            for (int i = 0; i < G.nodes; i++)
            {
                for (int j = 0; j < G.nodes; j++)
                {
                    if (i!=j)
                        G.graph[i][j] = Integer.MAX_VALUE;
                             
                }
            }
            
            for (int i = 0; i < G.roads; i++)
            {
                line = scanner.nextLine();
                parts = line.split(" ");
                int from = Integer.parseInt(parts[0]) - 1;
                int to = Integer.parseInt(parts[1]) - 1;
                int length = Integer.parseInt(parts[2]);
                G.graph[from][to] = length;
                G.graph[to][from] = length;
            }
            
           
            G.aliensLocation = new int[G.bases];
            
            for (int i = 0; i < G.bases; i++)
            {
                line = scanner.nextLine();
                G.aliensLocation[i] = Integer.parseInt(line) - 1;
            }
            
            
            for (int k = 0; k < G.nodes; k++)
                for (int i = 0; i < G.nodes; i++)
                    for (int j = 0; j < G.nodes; j++)
                    {
                        int ik = G.graph[i][k];
                        int kj = G.graph[k][j];
                        int ij = G.graph[i][j];
                        
                        if (ik == Integer.MAX_VALUE || kj == Integer.MAX_VALUE)
                            continue;
                        
                        if (ik + kj < ij)
                            G.graph[i][j] = ik + kj;
                    } 
            
            /*for (int i = 0; i < G.nodes; i++)
            {
                for (int j = 0; j < G.nodes; j++)
                {
                    System.out.print(G.graph[i][j]+" ");
                }
                System.out.println();
            }*/
            
            G.safe = new boolean[G.nodes]; 
            for (int i = 0; i < G.nodes; i++)
                G.safe[i] = true;
            int goodOne = G.nodes;
            
            
            for (int i = 0; i < G.bases; i++)
            {
                int newBase = G.aliensLocation[i];
                if (G.safe[newBase] == true)
                {
                    G.safe[newBase] = false;
                    goodOne--;
                }
                
                for (int j = 0; j < G.nodes; j++)
                {
                    if (G.graph[newBase][j] < G.distance && G.graph[newBase][j] != Integer.MAX_VALUE)
                    {
                        if (G.safe[j] == true)
                          {
                              G.safe[j] = false;
                               goodOne--;
                           }
                    }
                }
                
                System.out.println(goodOne);
            }
            
            if (G.bases == 0)
                System.out.println(G.nodes);            
            System.out.println();
            
        }
    }
    
}