import sys
input = sys.stdin.readline

N, M = map(int, input().split())
M //= 2
U = [0] * N
for i in range(N):
    U[i] = int(input())
    
G = [[] for i in range(N)]
for i in range(N - 1):
    u, v, c = map(int, input().split())
    G[u].append((v, c))
    G[v].append((u, c))
    

def non_rec_dfs(s):
    stack = [s]
    dp = [[0] * (M + 1) for _ in range(N)]
    for i in range(N):
        for j in range(M + 1):
            dp[i][j] = U[i]
        
    par = [-1] * N
    while stack:
        u = stack.pop()
        if u >= 0:
            stack.append(~u)
            for v, c in G[u]:
                if v == par[u]:
                    continue
                par[v] = u
                stack.append(v)
        else:
            u = ~u
            for v, c in G[u]:
                if v == par[u]:
                    continue
                for i in range(M, -1, -1):
                    for j in range(M + 1):                    
                        if i - c - j < 0:
                            break
                        dp[u][i] = max(dp[u][i],  dp[u][i - c - j] + dp[v][j])
                        
    return max(dp[0])

print(non_rec_dfs(0))