#pragma region Macros
#include <bits/stdc++.h>
#include <atcoder/all>
#if defined(LOCAL) || defined(_DEBUG)
#include "debug.hpp"
#else
#define O(...)
#define START()
#define STOP()
#define MEMORY()
#endif
using namespace std;
#define REP(i, n) for(int i=0, i##_len=(n); i<i##_len; ++i)
#define REPR(i, n) for(int i=(n); i>=0; --i)
#define FOR(i, n, m) for(int i=(m), i##_len=(n); i<i##_len; ++i)
#define EACH(i, v) for(const auto& i : v)
#define ALL(x) (x).begin(),(x).end()
#define ALLR(x) (x).rbegin(),(x).rend()
template<class T, class U>bool chmax(T &a, const U &b) { if (a<(T)b) { a=(T)b; return 1; } return 0; }
template<class T, class U>bool chmin(T &a, const U &b) { if (b<(T)a) { a=(T)b; return 1; } return 0; }
#define vec vector
#define umap unordered_map
#define uset unordered_set
using ll = long long;
using ld = long double;
using P = pair<ll, ll>;
using Tup = tuple<ll, ll, ll>;
using vl = vec<ll>;
#define fi first
#define se second
#define el endl
constexpr ll INF = numeric_limits<ll>::max()/2-1;

template<class T>
istream &operator>>(istream &stream, vec<T>& o){REP(i, o.size())stream >> o[i];return stream;}
#define I(T, ...) ;T __VA_ARGS__;__i(__VA_ARGS__);
void __i() {}
template<class T, class... Ts> void __i(T&& o, Ts&&... args){cin >> o;__i(forward<Ts>(args)...);}
#pragma endregion

void Main();

int main(){
    std::cin.tie(nullptr);
    std::cout << std::fixed << std::setprecision(15);
    Main();
    MEMORY();
    return 0;
}

#pragma region graph
struct edge{
    ll from, to, cost;
    bool operator<(const edge& r) const{return cost<r.cost;}
    bool operator>(const edge& r) const{return cost>r.cost;}
};
struct graph{
    ll V;
    vector<vector<edge> > G;
    graph(ll n){
        init(n);
    }
    void init(ll n){
        V = n;
        G.resize(V);
    }
    // 無向グラフ
    void add_edge(ll s, ll t, ll cost = 1){
        add_diedge(s, t, cost);
        add_diedge(t, s, cost);
    }
    // 有向グラフ
    void add_diedge(ll s, ll t, ll cost = 1){
        if(s < 0 || t < 0 || s >= V || t >= V) return;
        G[s].push_back({s, t, cost});
    }
    auto pos2d(ll height, ll width){
        return [height, width](ll y, ll x){
            return 
                (y < 0 || y >= height || x < 0 || x >= width)
                ? -1
                : y*width + x;
        };
    }
};
#pragma endregion

// O(|E|log|V|)
vl dijkstra(const graph& g, ll s){
    vector<ll> d(g.V, INF);
    umap<ll, ll> ret;
    ret[s] = d[s] = 0;
    priority_queue<P,vector<P>, greater<P>> que;
    que.push({0, s});
    while(!que.empty()){
        auto [c, v] = que.top(); que.pop();
        if(d[v]<c) continue;
        for(auto e : g.G[v]){
            if(d[e.to]>d[v]+e.cost){
                ret[e.to] = d[e.to] = d[v]+e.cost;
                que.push({d[e.to],e.to});
            }
        }
    }
    return d;
}

// x∈[l, r] | f(x) = true となる最大のxを返す
template <class Func>
ll binarySearch(ll l, ll r, Func f){
    while(l < r){
        const ll m = (l+r+1)/2;
        if(f(m)) l = m;
        else     r = m-1;
    }
    return l;
}

void Main(){
    I(ll, n, m, x);
    vl u(m), v(m), a(m), b(m);
    REP(i, m) {
        cin >> u[i] >> v[i] >> a[i] >> b[i];
        u[i]--; v[i]--;
    }
    ll ans = binarySearch(-1, 1e9, [&](ll mid) {
        // グラフの構成
        graph g(n);
        REP(i, m) {
            if(mid <= b[i]) {
                g.add_edge(u[i], v[i], a[i]);
            }
        }
        auto d = dijkstra(g, 0);
        return d[n-1] <= x;
    });
    cout << ans << el;
}