#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++)



struct heavy_light_decomposition {
private:

    int N;
    vector<int> P;
    vector<int> PP;
    vector<int> PD;
    vector<int> D;

public:

    vector<int> rangeL;
    vector<int> rangeR;

    heavy_light_decomposition(const vector<vector<int>>& E = { {} }) {
        N = E.size();
        P.assign(N, -1);
        vector<int> I = { 0 };
        rep(i, I.size()) {
            int p = I[i];
            for (int e : E[p]) if (P[p] != e) {
                I.push_back(e);
                P[e] = p;
            }
        }
        vector<int> Z(N, 1);
        for (int i = N - 1; i >= 1; i--) Z[P[I[i]]] += Z[I[i]];
        PP.resize(N);
        for (int i = 0; i < N; i++) PP[i] = i;
        vector<int> nx(N, -1);
        for (int p : I) if (p != 0) {
            if (nx[P[p]] == -1) nx[P[p]] = p;
            if (Z[nx[P[p]]] < Z[p]) nx[P[p]] = p;
        }
        rep(i, N) if (nx[i] != -1) PP[nx[i]] = i;
        for (int p : I) if (p != 0) PP[p] = PP[PP[p]];

        PD.assign(N, N);
        PD[0] = 0;
        for (int p : I) if (p != 0) PD[p] = min(PD[PP[p]], PD[P[p]] + 1);
        D.assign(N, 0);
        for (int p : I) D[p] = (p == 0) ? 0 : (D[P[p]] + 1);

        rangeL.assign(N, -1);
        rangeR.assign(N, -1);
        vector<int> dfs;
        int ir = 0;
        dfs.push_back(0);
        while (dfs.size()) {
            int p = dfs.back();
            dfs.pop_back();
            if (p < 0) { rangeR[-1 - p] = ir; continue; }
            dfs.push_back(-1 - p);
            for (int e : E[p]) if (P[p] != e) if (e != nx[p]) dfs.push_back(e);
            if (nx[p] != -1) dfs.push_back(nx[p]);
            rangeL[p] = ir++;
        }
    }

    int lca(int u, int v) {
        if (PD[u] < PD[v]) swap(u, v);
        while (PD[u] > PD[v]) u = P[PP[u]];
        while (PP[u] != PP[v]) { u = P[PP[u]]; v = P[PP[v]]; }
        return (D[u] > D[v]) ? v : u;
    }

    vector<pair<int, int>> getpath(int r, int c) {
        vector<pair<int, int>> res;
        while (PD[r] < PD[c]) {
            res.push_back({ rangeL[PP[c]], rangeL[c] + 1 });
            c = P[PP[c]];
        }
        if (PP[r] != PP[c]) return {};
        if (D[r] > D[c]) return {};
        res.push_back({ rangeL[r], rangeL[c] + 1 });
        reverse(res.begin(), res.end());
        return move(res);
    }
};


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;
heavy_light_decomposition hld;
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);
    }

    hld = heavy_light_decomposition(hldE);

    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();

    //rep(i,N) cout << prev_black[i] << " "; cout << endl;
    //rep(i,N) cout << block_size[i] << " "; cout << endl;
    
    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;