n, m = map(int, input().split())
u = [int(input()) for _ in range(n)]
graph = [[] for _ in range(n)]
for _ in range(n-1):
    a, b, c = map(int, input().split())
    graph[a].append((b, c))
    graph[b].append((a, c))
dp = [[0]*(m+1) for _ in range(n)]
def dfs(i, parent):
    for j, cost in graph[i]:
        if j == parent:
            continue
        dfs(j, i)
        for k in range(m+1)[::-1]:
            for l in range(m+1)[::-1]:
                if k<l+cost*2:
                    continue
                dp[i][k] = max(dp[i][k], dp[i][k-l-cost*2]+dp[j][l])
    for j in range(m+1):
        dp[i][j] += u[i]
dfs(0, 0)
print(max(dp[0]))