using System;
using System.Text;
using System.Linq;
using System.Collections.Generic;

public class Program
{
    public void Proc() {
        Reader.IsDebug = false;
        int[] inpt = Reader.ReadLine().Split(' ').Select(a=>int.Parse(a)).ToArray();
        this.Map = new int[inpt[0]];
        this.Tax = new long[inpt[0]];
        this.TimeLimit = inpt[1];

        for(int i=0; i<inpt[0]; i++) {
            this.Tax[i] = long.Parse(Reader.ReadLine());
            this.Map[i] = int.MaxValue;
        }

        for(int i=0; i<this.Map.Length-1; i++) {
            inpt = Reader.ReadLine().Split(' ').Select(a=>int.Parse(a)).ToArray();
            int[][] posList = new int[][]{new int[]{inpt[0], inpt[1]}, new int[]{inpt[1], inpt[0]}};
            foreach(int[] pos in posList) {
                if(!this.Road.ContainsKey(pos[0])) {
                    this.Road.Add(pos[0], new Dictionary<int, int>());
                }
                this.Road[pos[0]][pos[1]] = inpt[2];
            }
        }

        this.Map[0] = 0;
        Queue<int> que = new Queue<int>();
        que.Enqueue(0);
        while(que.Count > 0) {
            int idx = que.Dequeue();
            if(!Road.ContainsKey(idx)) {
                continue;
            }
            foreach(int moveTo in Road[idx].Keys) {
                int next = Map[idx] + this.Road[idx][moveTo];
                if(Map[moveTo] > next) {
                    que.Enqueue(moveTo);
                    Map[moveTo] = next;
                }
            }
        }

        Console.WriteLine(Math.Max(Tax[0], GetAns(0, new int[this.Map.Length], this.TimeLimit)));

    }

    private Dictionary<int, Dictionary<int, Dictionary<string, long>>> dic = new Dictionary<int, Dictionary<int, Dictionary<string, long>>>();

    private long GetAns(int pos, int[] flags, int remain) {
        if(this.Map[pos] > remain) {
            return -1;
        }

        if(pos == 0 && flags[0] == 1) {
            return 0;
        }

        string key = string.Join(string.Empty, flags);
        if(!dic.ContainsKey(pos)) {
            dic.Add(pos, new Dictionary<int, Dictionary<string, long>>());
        }
        if(!dic[pos].ContainsKey(remain)) {
            dic[pos].Add(remain, new Dictionary<string, long>());
        }
        if(dic[pos][remain].ContainsKey(key)) {
            return dic[pos][remain][key];
        }


        long ans = -1;

        long addTax = 0;
        if(flags[pos] == 0) {
            addTax = Tax[pos];
            flags[pos] = 1;
        }

        foreach(int moveTo in this.Road[pos].Keys) {
            long ret = this.GetAns(moveTo, flags, remain - this.Road[pos][moveTo]);
            if(ret >= 0) {
                ret+=addTax;
            }
            ans = Math.Max(ans, ret);
        }

        if(addTax > 0) {
            flags[pos] = 0;
        }
        dic[pos][remain][key] = ans;
        return ans;
    }

    private int TimeLimit;

    private int[] Map;
    private Dictionary<int, Dictionary<int, int>> Road = new Dictionary<int, Dictionary<int, int>>();

    private long[] Tax;


    public class Reader {
        public static bool IsDebug = true;
        private static System.IO.StringReader SReader;
        private static string InitText = @"


2 50
10
50
0 1 50


";
        public static string ReadLine() {
            if(IsDebug) {
                if(SReader == null) {
                    SReader = new System.IO.StringReader(InitText.Trim());
                }
                return SReader.ReadLine();
            } else {
                return Console.ReadLine();
            }
        }
    }
    public static void Main(string[] args)
    {
        Program prg = new Program();
        prg.Proc();
    }
}