#include <bits/stdc++.h>
#define rep(i, n) for (lli i = 0; i < (n); i++)
#define rrep(i, n) for (lli i = (n)-1; i >= 0; i--)
using namespace std;
using lli = long long int;
vector<pair<int, int>> e[203];

int n, m;
lli u[206];
vector<lli> sub(int cur, int par)
{
    vector<vector<lli>> v;
    for (auto to : e[cur]) {
        if (to.first == par)
            continue;
        auto vv = sub(to.first, cur);
        vector<lli> hoge(m + 1, 0);
        rep(i, vv.size())
        {
            if (i + 2 * to.second > m) {
                break;
            }
            hoge[i + 2 * to.second] = vv[i];
        }
        v.push_back(hoge);
    }
    vector<lli> dp[2];
    rep(i, 2) dp[i].assign(m + 1, u[cur]);
    rep(i, v.size())
    {
        rep(j, m + 1)
        {
            rep(k, m + 1)
            {
                if (j + k > m) {
                    break;
                }
                dp[(i + 1) % 2][j + k] = max(dp[(i + 1) % 2][j + k], dp[i][j] + v[i][k]);
            }
        }
        dp[i % 2].assign(m + 1, 0);
    }
    return dp[v.size() & 1];
}
int main()
{
    cin >> n >> m;
    rep(i, n) cin >> u[i];
    int a, b, c;
    rep(i, n - 1)
    {
        cin >> a >> b >> c;
        e[a].push_back(make_pair(b, c));
        e[b].push_back(make_pair(a, c));
    }
    cout << sub(0, -1)[m] << endl;
}