#include <bits/stdc++.h>
using namespace std;

using ll = long long;
#define rep(i, n) for (ll i = 0; i < ll(n); i++)
#define rep2(i, l, r) for (ll i = ll(l); i < ll(r); i++)

using vi = vector<int>;
using vvi = vector<vi>;
using vll = vector<ll>;

struct CentroidDecomposition {
  int n;
  vvi g;
  vi sz, order, dep, par;

  CentroidDecomposition(int n, vvi &g) : n(n), g(g) {
    sz.resize(n);
    dep.resize(n, -1);
    par.resize(n, -1);
    dfs(0, -1);
    calc(0, -1, 0);
  };

  int dfs(int v, int p) {
    sz[v] = 1;
    for (auto u : g[v]) {
      if (u != p) sz[v] += dfs(u, v);
    }
    return sz[v];
  }

  void calc(int v, int p, int d) {
    int now = v;
    while (true) {
      int nxt = -1;
      for (auto u : g[now]) {
        if (dep[u] == -1 && sz[u] * 2 > sz[now]) nxt = u;
      }
      if (nxt == -1) break;
      int rem = sz[now] - sz[nxt];
      sz[nxt] = sz[now];
      sz[now] = rem;
      now = nxt;
    }
    dep[now] = d;
    par[now] = p;
    for (auto u : g[now]) {
      if (dep[u] == -1) {
        calc(u, v, d + 1);
      }
    }
  }
};

int main() {
  int n, k;
  cin >> n >> k;
  vvi g(n);
  vector<vector<pair<int, int>>> g2(n);
  rep(i, n - 1) {
    int u, v, c;
    cin >> u >> v >> c;
    u--;
    v--;
    g[u].push_back(v);
    g[v].push_back(u);
    g2[u].push_back({v, c});
    g2[v].push_back({u, c});
  }

  CentroidDecomposition CD(n, g);
  ll ans = 0;
  rep(center, n) {
    map<pair<int, int>, int> cnt1;
    map<int, int> cnt2, cnt3;
    for (auto [v0, col] : g2[center]) {
      vector<pair<int, int>> add;
      vector<array<int, 4>> todo = {{v0, (int)center, col, -1}};
      while (!todo.empty()) {
        auto [v, p, col1, col2] = todo.back();
        todo.pop_back();
        if (CD.dep[v] < CD.dep[center]) break;
        if (col1 < col2) swap(col1, col2);
        if (col2 == -1) {
          ans += cnt2[col1];
        } else {
          ans += cnt1[{col1, col2}];
          ans += cnt3[col1];
          ans += cnt3[col2];
          ans += 1;
        }
        add.push_back({col1, col2});
        for (auto [u, col] : g2[v]) {
          if (u != p) {
            if (col == col1 || col == col2) {
              todo.push_back({u, v, col1, col2});
            } else if (col2 == -1) {
              todo.push_back({u, v, col1, col});
            }
          }
        }
      }
      for (auto [col1, col2] : add) {
        if (col2 != -1) {
          cnt1[{col1, col2}]++;
          cnt2[col1]++;
          cnt2[col2]++;
        } else {
          cnt3[col1]++;
        }
      }
    }
    ll rem = 0;
    for (auto [col, cnt] : cnt3) {
      ans += rem * cnt;
      rem += cnt;
    }
  }
  cout << ans << endl;
}