import sys
sys.setrecursionlimit(10**7)
def main():
    N, M = map(int, input().split())
    U = [int(input()) for _ in range(N)]
    G = [[] for _ in range(N)]
    for _ in range(N-1):
        A,B,C = map(int, input().split())
        G[A].append([B, C])
        G[B].append([A, C])

    dp = [[0]*(M+1) for _ in range(N)]
    def dfs(x, par=-1):
        dp[x][0] = U[x]
        for nx, t in G[x]:
            if nx==par:
                continue
            dfs(nx, x)
            for m in range(M+1)[::-1]:
                for mm in range(M+1):
                    T = m+mm+2*t
                    if T<M+1: dp[x][T] = max(dp[x][T], dp[x][m]+dp[nx][mm])
    dfs(0)
    print(max(dp[0]))


main()