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

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    ll C, c = 0;
    int N, K, ans = 0, i = 0;
    cin >> N >> K >> C;
    vector<int> ps(N, -1), d(N, 1 << 30), mx(K);
    vector<T> E(K);
    for(auto &&[u, v, w, p] : E){
        cin >> u >> v >> w >> p;
        u--, v--;
        swap(w, u);
    }
    sort(E.begin(), E.end());
    for(auto &&[w, v, u, p] : E){
        while(u != v){
            if(d[v] > d[u]) swap(v, u);
            if(ps[v] < 0){
                N--;
                c += w;
                mx[i] = w;
                while(ps[u] >= 0) u = ps[u];
                if(-ps[v] < -ps[u]) swap(u, v);
                ps[v] += ps[u];
                ps[u] = v;
                d[u] = w;
                break;
            }
            mx[i] = d[v], v = ps[v];
        }
        i++;
    }
    if(c > C || N != 1){
        cout << -1 << '\n';
        exit(0);
    }
    i = 0;
    for(auto &&[w, v, u, p] : E) if(c + w - mx[i++] <= C) ans = max(ans, p);
    cout << ans << '\n';
}