#include<bits/stdc++.h>
#include<atcoder/all>
#include "testlib.h"
using namespace std;
using namespace atcoder;

const int Nmin = 1, Nmax = 100'000;
const int Kmin = 1, Kmax = 100'000;
const long long Cmin = 1, Cmax = 10'000'000'000;
const int Wmin = 0, Wmax = 100'000;
const int Pmin = 1, Pmax = 100'000;

int main(){
    // validation を始める際に必ず行う
    registerValidation();

    int N = inf.readInt(Nmin, Nmax);
    inf.readSpace();
    int K = inf.readInt(Kmin, Kmax);
    inf.readSpace();
    inf.readInt(Cmin, Cmax);
    inf.readEoln();

    set<pair<int,int>> Edges;
    dsu uf(N);
    for(int i = 0; i < K; i++) {
        int U = inf.readInt(1, N);
        inf.readSpace();
        int V = inf.readInt(1, N);
        inf.readSpace();
        int W = inf.readInt(Wmin, Wmax);
        inf.readSpace();
        int P = inf.readInt(Pmin, Pmax);
        inf.readEoln();

        assert(U != V);
        if(U > V) swap(U, V);
        assert(Edges.find(pair<int,int>(U, V)) == Edges.end());
        Edges.insert(pair<int,int>(U, V));
        uf.merge(U - 1, V - 1);
    }

    assert(uf.groups().size() == 1);
    inf.readEof();
    return 0;
}