#include <bits/stdc++.h>
// #include "atcoder/modint"

using i64 = long long;
// using Fp = atcoder::modint998244353;
constexpr i64 inf = 1ll << 60;

struct Edge {
    int to;
    i64 cost;
    i64 width;
};

int main() {
    int N, M;
    i64 X;
    std::cin >> N >> M >> X;
    std::vector<int> U(M), V(M);
    std::vector<i64> A(M), B(M);
    std::vector<std::vector<Edge>> graph(N);
    for (int i = 0; i < M; ++i) {
        std::cin >> U[i] >> V[i];
        --U[i], --V[i];
        std::cin >> A[i] >> B[i];
        graph[U[i]].push_back({V[i], A[i], B[i]});
        graph[V[i]].push_back({U[i], A[i], B[i]});
    }

    i64 ok = -1, ng = 1ll << 60;

    auto calcDist = [&](i64 m) {
        std::vector<i64> dist(N, inf);
        dist[0] = 0;
        std::priority_queue<std::pair<i64, int>, std::vector<std::pair<i64, int>>, std::greater<std::pair<i64, int>>> pq;
        pq.push({0, 0});
        while (not pq.empty()) {
            const auto [nd, f] = pq.top();
            pq.pop();
            if (nd > dist[f]) continue;
            for (const auto &[t, c, w] : graph[f]) {
                if (w < m) continue;
                if (dist[t] > dist[f] + c) {
                    dist[t] = dist[f] + c;
                    pq.push({dist[t], t});
                }
            }
        }
        return dist[N - 1];
    };

    while (ng - ok > 1) {
        const auto mid = (ok + ng) / 2;
        if (calcDist(mid) <= X) ok = mid;
        else ng = mid;
    }
    std::cout << ok << std::endl;
}