#include <bits/stdc++.h>
using namespace std;
#ifdef tabr
#include "library/debug.cpp"
#else
#define debug(...)
#endif

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, m;
    long long f;
    cin >> n >> m >> f;
    vector<int> x(m), y(m), a(m), b(m);
    vector<vector<int>> g(n);
    for (int i = 0; i < m; i++) {
        cin >> x[i] >> y[i] >> a[i] >> b[i];
        x[i]--;
        y[i]--;
        g[x[i]].emplace_back(i);
        g[y[i]].emplace_back(i);
    }
    int low = -1, high = 1e9 + 10;
    while (high - low > 1) {
        auto mid = (high + low) >> 1;
        vector<long long> d(n, f + 1);
        priority_queue<pair<long long, int>, vector<pair<long long, int>>, greater<pair<long long, int>>> pq;
        d[0] = 0;
        pq.emplace(d[0], 0);
        while (!pq.empty()) {
            auto [dv, v] = pq.top();
            pq.pop();
            if (d[v] != dv) {
                continue;
            }
            for (int id : g[v]) {
                int to = x[id] ^ y[id] ^ v;
                if (b[id] < mid) {
                    continue;
                }
                long long cost = d[v] + a[id];
                if (d[to] > cost) {
                    d[to] = cost;
                    pq.emplace(d[to], to);
                }
            }
        }
        if (d[n - 1] <= f) {
            low = mid;
        } else {
            high = mid;
        }
    }
    cout << low << '\n';
    return 0;
}