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

struct CentroidDecomposition {
  int n, r;
  vector<vector<int>> g, cd;
  vector<int> ord, szs;
  CentroidDecomposition(vector<vector<int>> &gg): g(gg), n(gg.size()), cd(n), szs(n,-1) {
    calc(0); dfs(0,-1,n,-1);
  }
  void calc(int v) {
    stack<int> s; s.emplace(v);
    while (s.size()) {
      int i = s.top(); s.pop();
      if (i<0) szs[~i]=1;
      else { szs[i]=0; s.emplace(~i); }
      for(auto e:g[i<0?~i:i]) {
        if (!szs[e]) continue;
        if (i<0) szs[~i] += szs[e];
        else s.emplace(e);
      }
    }
  }
  void dfs(int v, int p, int sz, int root){
    if (szs[v]==0) return;
    begin:
    for(auto e:g[v]) {
      if (p==e or szs[e]<sz-sz/2) continue;
      p=v; v=e; goto begin;
    }
    if(root!=-1)cd[root].emplace_back(v);
    else r=v;
    ord.push_back(v);
    calc(v); szs[v]=0;
    for(auto e:g[v])dfs(e,v,szs[e],v);
    return;
  }
};

int main() {
  cin.tie(0)->sync_with_stdio(false);
  int n, k;
  cin >> n >> k;
  using pii = pair<int, int>;
  vector<vector<int>> g(n);
  vector<vector<pii>> edges(n);
  for (int i = 0; i < n - 1; i++) {
    int u, v, c;
    cin >> u >> v >> c;
    u--, v--, c--;
    g[u].push_back(v);
    g[v].push_back(u);
    edges[u].emplace_back(v, c);
    edges[v].emplace_back(u, c);
  }
  CentroidDecomposition cd(g);
  vector<int> visited(n);
  ll ans = 0;
  for (int ce : cd.ord) {
    int cnt0 = 0; // *, -
    int cnt1 = 0; // *, *
    map<pii, int> cnt2; // x, y
    map<int, int> cnt3; // x, *
    map<int, int> cnt4; // x, -
    auto f1 = [&](auto self, int node, int parent, int c1, int c2) -> void {
      if (c2 == -1) {
        cnt0++;
        cnt4[c1]++;
      } else {
        cnt1++;
        cnt2[make_pair(min(c1, c2), max(c1, c2))]++;
        cnt3[c1]++;
        cnt3[c2]++;
      }
      for (auto [child, c] : edges[node]) {
        if (child == parent || visited[child]) continue;
        if (c1 == c) {
          self(self, child, node, c1, c2);
        } else if (c2 == c || c2 == -1) {
          self(self, child, node, c1, c);
        }
      }
    };
    auto f2 = [&](auto self, int node, int parent, int c1, int c2) -> void {
      if (c2 == -1) {
        ans += cnt0 - cnt4[c1] + cnt3[c1];
      } else {
        ans += cnt2[make_pair(min(c1, c2), max(c1, c2))] + cnt4[c1] + cnt4[c2];
      }
      for (auto [child, c] : edges[node]) {
        if (child == parent || visited[child]) continue;
        if (c1 == c) {
          self(self, child, node, c1, c2);
        } else if (c2 == c || c2 == -1) {
          self(self, child, node, c1, c);
        }
      }
    };
    for (auto [child, c] : edges[ce]) {
      if (visited[child]) continue;
      f2(f2, child, ce, c, -1);
      f1(f1, child, ce, c, -1);
    }
    ans += cnt1;
    visited[ce] = true;
  }
  cout << ans << endl;
}