N, M = map(int, input().split())
U = [int(input()) for _ in range(N)]
tree = [[] for _ in range(N)]
for _ in range(N-1):
    a, b, c = map(int, input().split())
    tree[a].append((b, c))
    tree[b].append((a, c))

# 使用した時間を入れる
dp = [[U[i]] * (M + 1) for i in range(N)]


def dfs(v, p=-1):
    for nv, nw in tree[v]:
        if nv == p:
            continue
        dfs(nv, v)
        for m1 in range(M, -1, -1):
            for m2 in range(M-m1+1):
                t = m1 + 2*nw + m2
                if t <= M:
                    dp[v][t] = max(dp[v][t], dp[v][m1] + dp[nv][m2])

dfs(0)
print(max(dp[0]))