#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
istream &operator>>(istream &is, modint &a) { long long v; is >> v; a = v; return is; }
ostream &operator<<(ostream &os, const modint &a) { return os << a.val(); }
istream &operator>>(istream &is, modint998244353 &a) { long long v; is >> v; a = v; return is; }
ostream &operator<<(ostream &os, const modint998244353 &a) { return os << a.val(); }
istream &operator>>(istream &is, modint1000000007 &a) { long long v; is >> v; a = v; return is; }
ostream &operator<<(ostream &os, const modint1000000007 &a) { return os << a.val(); } 

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define rep(i,n) for (int i = 0;i < (int)(n); i++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define my_sort(x) sort(x.begin(), x.end())
#define my_max(x) *max_element(all(x))
#define my_min(x) *min_element(all(x))
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
const int INF = (1<<30) - 1;
const ll LINF = (1LL<<62) - 1;
const int MOD = 998244353;
const int MOD2 = 1e9+7;
const double PI = acos(-1);
vector<int> di = {1,0,-1,0};
vector<int> dj = {0,1,0,-1};

#ifdef LOCAL
#  include <debug_print.hpp>
#  define debug(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define debug(...) (static_cast<void>(0))
#endif

struct Edge{
    ll cost;
    int to;
};
using Graph = vector<vector<Edge>>;
vector<ll> dijkstra(int st, Graph &g){
    int N = g.size();
    vector<ll> dist(N,LINF);
    dist[st] = 0ll;
    using pli = pair<ll,int>;
    priority_queue<pli,vector<pli>,greater<pli>> pq;
    pq.emplace(pli{0ll,st});
    while(!pq.empty()){
        ll time = pq.top().first;
        int now = pq.top().second;
        pq.pop();
        if (time > dist[now])continue;
        for(auto e:g[now]){
            ll c = e.cost;
            int nxt = e.to;
            if (c + time < dist[nxt]){
                dist[nxt] = c + time;
                pq.push(pli{c+time,nxt});
            }
        }
    }
    return dist;
}

int main(){
    cin.tie(0);
    ios_base::sync_with_stdio(false);
    int N,M; cin >> N >> M;
    ll X; cin >> X;
    vector<int> u(M), v(M);
    vector<ll> a(M), b(M);
    rep(i,M){
        cin >> u[i] >> v[i] >> a[i] >> b[i];
        u[i]--;
        v[i]--;
    }
    // 大きさ1
    Graph g1(N);
    rep(i,M){
        g1[u[i]].push_back(Edge{a[i], v[i]});
        g1[v[i]].push_back(Edge{a[i], u[i]});
    }
    auto dist1 = dijkstra(0, g1);
    if (dist1[N - 1] > X){
        cout << -1 << endl;
    }
    else{
        ll ok = 0, ng = 1LL<<30;
        while(abs(ok - ng) > 1){
            ll mid = (ok + ng) / 2;
            Graph g(N);
            rep(i,M){
                if (b[i] >= mid){
                    g[u[i]].push_back(Edge{a[i], v[i]});
                    g[v[i]].push_back(Edge{a[i], u[i]});
                }
            }
            auto dist = dijkstra(0, g);
            debug(dist, mid, ok, ng);
            if (dist[N - 1] <= X) ok = mid;
            else ng = mid;
        }
        cout << ok << endl;
    }
}