#include <algorithm>
#include <iostream>
#include <iomanip>
#include <limits.h>
#include <map>
#include <math.h>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <string>
#include <utility>
#include <vector>
#include <stack>
#include <complex>

using namespace std;
#define rep(i, n) for (int i = 0; i < n; i++)
#define rep1(i, n) for (int i = 1; i < n + 1; i++)
#define rev(i, n) for (int i = n - 1; i >= 0; i--)
#define all(A) A.begin(), A.end()
#define itr(A, l, r) A.begin() + l, A.begin() + r
#define debug(var) cout << #var << " = " << var << endl;
typedef long long ll;

template <typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2> &p)
{
    os << "(" << p.first << "," << p.second << ")";
    return os;
}

template <typename T1, typename T2>
istream &operator>>(istream &is, pair<T1, T2> &p)
{
    is >> p.first >> p.second;
    return is;
}

template <typename T>
ostream &operator<<(ostream &os, const vector<T> &v)
{
    for (int i = 0; i < (int)v.size(); i++)
    {
        os << v[i] << (i + 1 != (int)v.size() ? " " : "");
    }
    return os;
}

template <typename T>
ostream &operator<<(ostream &os, const vector<vector<T>> &v)
{
    for (int i = 0; i < (int)v.size(); i++)
    {
        os << v[i] << endl;
    }
    return os;
}

template <typename T>
ostream &operator<<(ostream &os, const vector<vector<vector<T>>> &v)
{
    for (int i = 0; i < (int)v.size(); i++)
    {
        os << "i = " << i << endl;
        os << v[i];
    }
    return os;
}

template <typename T>
istream &operator>>(istream &is, vector<T> &v)
{
    for (T &in : v)
        is >> in;
    return is;
}

template <typename T, typename S>
ostream &operator<<(ostream &os, map<T, S> &mp)
{
    for (auto &[key, val] : mp)
    {
        os << key << ":" << val << " ";
    }
    cout << endl;
    return os;
}

template <typename T>
ostream &operator<<(ostream &os, set<T> st)
{
    auto itr = st.begin();
    for (int i = 0; i < (int)st.size(); i++)
    {
        os << *itr << (i + 1 != (int)st.size() ? " " : "");
        itr++;
    }
    return os;
}

template <typename T>
ostream &operator<<(ostream &os, multiset<T> st)
{
    auto itr = st.begin();
    for (int i = 0; i < (int)st.size(); i++)
    {
        os << *itr << (i + 1 != (int)st.size() ? " " : "");
        itr++;
    }
    return os;
}

template <typename T>
ostream &operator<<(ostream &os, queue<T> q)
{
    while (q.size())
    {
        os << q.front() << " ";
        q.pop();
    }
    return os;
}

template <typename T>
ostream &operator<<(ostream &os, deque<T> q)
{
    while (q.size())
    {
        os << q.front() << " ";
        q.pop_front();
    }
    return os;
}

template <typename T>
ostream &operator<<(ostream &os, stack<T> st)
{
    while (st.size())
    {
        os << st.top() << " ";
        st.pop();
    }
    return os;
}

template <typename T>
ostream &operator<<(ostream &os, priority_queue<T> pq)
{
    while (pq.size())
    {
        os << pq.top() << " ";
        pq.pop();
    }
    return os;
}

template <typename T>
ostream &operator<<(ostream &os, priority_queue<T, vector<T>, greater<T>> mpq)
{
    while (mpq.size())
    {
        os << mpq.top() << " ";
        mpq.pop();
    }
    return os;
}

int main()
{
    ll n, m, x;
    cin >> n >> m >> x;
    using S = pair<ll, pair<ll, ll>>;
    vector<vector<S>> to(n, vector<S>());
    rep(i, m)
    {
        ll u, v, a, b;
        cin >> u >> v >> a >> b;
        u--;
        v--;
        to[u].push_back({v, {a, b}});
        to[v].push_back({u, {a, b}});
    }
    // debug(to);
    ll ng = 1e18;
    ll ok = 0;
    while (abs(ng - ok) > 1)
    {
        ll mid = ng + ok;
        mid /= 2;
        // debug(mid);
        priority_queue<S, vector<S>, greater<S>> q;
        q.push({0, {0, 0}});
        vector<ll> dist(n, 1e18);
        while (q.size())
        {
            auto [now, info] = q.top();
            q.pop();
            // debug(now);
            auto [cost, width] = info;
            if (cost >= dist[now])
            {
                continue;
            }
            dist[now] = cost;
            for (auto [next, next_info] : to[now])
            {
                // debug(next);
                // debug(next_info);
                auto [next_cost, next_width] = next_info;
                if (next_width < mid)
                {
                    continue;
                }
                // debug(next_info);
                if (cost + next_cost >= dist[next])
                {
                    continue;
                }
                q.push({next, {cost + next_cost, next_width}});
            }
        }
        // debug(dist);
        if (dist[n - 1] <= x)
        {
            ok = mid;
        }
        else
        {
            ng = mid;
        }
    }
    // cout << ok << endl;
    priority_queue<S, vector<S>, greater<S>> q;
    q.push({0, {0, 0}});
    vector<ll> dist(n, 1e18);
    while (q.size())
    {
        auto [now, info] = q.top();
        q.pop();
        // debug(now);
        auto [cost, width] = info;
        if (cost >= dist[now])
        {
            continue;
        }
        dist[now] = cost;
        for (auto [next, next_info] : to[now])
        {
            // debug(next);
            // debug(next_info);
            auto [next_cost, next_width] = next_info;
            if (next_width < ok)
            {
                continue;
            }
            // debug(next_info);
            if (cost + next_cost >= dist[next])
            {
                continue;
            }
            q.push({next, {cost + next_cost, next_width}});
        }
    }
    // debug(dist);
    if(dist[n-1] <= x){
        cout << ok << endl;
    }else{
        cout << -1 << endl;
    }

}