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))

dist = [0]*n
parent = [-1]*n
order = [0]
for v in order:
    for u,c in g[v]:
        if parent[v] == u: continue
        dist[u] = 2*c
        parent[u] = v
        order.append(u)

dp = [[U[i]]*(m+1) for i in range(n)]
for v in order[n-1:0:-1]:
    p,d = parent[v],dist[v]
    for i in range(m,d-1,-1):
        for k in range(i-d+1):
            dp[p][i] = max(dp[p][i],dp[p][i-k-d] + dp[v][k])

print(max(dp[0]))