#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(n); i++)



class CoordinateCompress {
    using Elem = i64;
    static const Elem negInf = -1001001001001001001;
    vector<pair<Elem, int>> G;
    vector<int> res;
    vector<Elem> mRealval;
    Elem mMaxcoord;
    bool ok = true;
    void calc() {
        if (ok) return;
        sort(G.begin(), G.end());
        res.resize(G.size());
        mRealval.clear();
        Elem x = negInf;
        int p = -1;
        rep(i, G.size()) {
            if (x != G[i].first) { x = G[i].first; mRealval.push_back(x); p++; }
            res[G[i].second] = p;
        }
        mMaxcoord = p;
        ok = true;
    }
public:
    int push(Elem x) {
        ok = false;
        G.push_back({ x,(int)G.size() });
        return G.back().second;
    }
    int operator[](int i) {
        calc();
        return res[i];
    }
    Elem realval(int x) {
        calc();
        return mRealval[x];
    }
    Elem maxcoord() {
        calc();
        return mMaxcoord;
    }
};


struct Edge{ int to; u32 h; };

int N;
vector<vector<Edge>> E;
vector<vector<int>> hldE;
vector<int> P;
vector<int> Z;

CoordinateCompress CCH;
vector<u32> H;


vector<vector<int>> black_stack;
vector<int> prev_black;
vector<int> block_size;
vector<int> root_size;

i64 ans;

void dfs(int p = 0, int pre = -1){
    if(pre == -1){
        black_stack.assign(N,{0});
        prev_black.assign(N,0);
        block_size.assign(N,0);
        root_size.assign(N,N);
        ans = 0;
    }

    int h = H[p];
    block_size[p] = Z[p];
    prev_black[p] = black_stack[h].back();

    if(prev_black[p] != 0) block_size[prev_black[p]] -= Z[p];
    else root_size[h] -= Z[p];

    for(int e : hldE[p]) if(e != pre){
        black_stack[H[p]].push_back(e);
        dfs(e,p);
        black_stack[H[p]].pop_back();
    }
}


int main(){
    cin >> N;
    E.resize(N);
    hldE.resize(N);
    rep(i,N-1){
        int u,v; u32 c; cin >> u >> v >> c; u--; v--;
        E[u].push_back({ v,c });
        E[v].push_back({ u,c });
        hldE[u].push_back(v);
        hldE[v].push_back(u);
    }

    vector<int> I = {0};
    P.assign(N,-1);
    H.assign(N,0);
    rep(i,I.size()){
        int p = I[i];
        for(auto e : E[p]){
            if(P[p] == e.to) continue;
            I.push_back(e.to);
            P[e.to] = p;
            H[e.to] = H[p] ^ e.h;
        }
    }
    Z.assign(N,1);
    for(int i=N-1; i>=1; i--) Z[P[I[i]]] += Z[I[i]];

    rep(i,N) H[i] = CCH.push(H[i]);
    rep(i,N) H[i] = CCH[H[i]];

    dfs();
    
    i64 ans = 0;
    for(int p=1; p<N; p++) ans += block_size[p];
    for(int p=1; p<N; p++){
        if(prev_black[p] != 0) ans += block_size[prev_black[p]];
        else ans += root_size[H[p]];
    }
    cout << ans << endl;

    return 0;
}




struct ios_do_not_sync {
    ios_do_not_sync() {
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} ios_do_not_sync_instance;