import java.io.*; import java.util.*; import java.util.stream.*; public class Main { static ArrayList> graph = new ArrayList<>(); static int[] values; public static void main(String[] args) throws Exception { Scanner sc = new Scanner(); int n = sc.nextInt(); int m = sc.nextInt(); values = new int[n]; for (int i = 0; i < n; i++) { values[i] = sc.nextInt(); graph.add(new HashMap<>()); } for (int i = 0; i < n - 1; i++) { int a = sc.nextInt(); int b = sc.nextInt(); int c = sc.nextInt(); graph.get(a).put(b, c); graph.get(b).put(a, c); } TreeMap ans = getMap(0, 0, m); System.out.println(ans.lastEntry().getValue()); } static TreeMap getMap(int idx, int p, int v) { if (v < 0) { return new TreeMap<>(); } TreeMap ans = new TreeMap<>(); ans.put(0, values[idx]); for (int x : graph.get(idx).keySet()) { if (p == x) { continue; } int cost = graph.get(idx).get(x) * 2; TreeMap tmp = getMap(x, idx, v - cost); Integer key = Integer.MAX_VALUE; while ((key = ans.lowerKey(key)) != null) { for (int y : tmp.keySet()) { if (y + cost + key > v) { break; } Integer next = y + cost + key; if (ans.floorEntry(next).getValue() >= ans.get(key) + tmp.get(y)) { continue; } int value = ans.get(key) + tmp.get(y); ans.put(next, value); while ((next = ans.higherKey(next)) != null) { if (ans.get(next) > value) { break; } ans.remove(next); } } } } return ans; } } class Utilities { static String arrayToLineString(Object[] arr) { return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n")); } static String arrayToLineString(int[] arr) { return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new)); } } class Scanner { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer st = new StringTokenizer(""); StringBuilder sb = new StringBuilder(); public Scanner() throws Exception { } public int nextInt() throws Exception { return Integer.parseInt(next()); } public long nextLong() throws Exception { return Long.parseLong(next()); } public double nextDouble() throws Exception { return Double.parseDouble(next()); } public int[] nextIntArray() throws Exception { return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray(); } public String next() throws Exception { while (!st.hasMoreTokens()) { st = new StringTokenizer(br.readLine()); } return st.nextToken(); } }