typedef long long ll;
typedef long double ld;

#include <bits/stdc++.h>
using namespace std;
#define int long long

signed main(){
    ll n,m,x;
    std::cin >> n>>m>>x;
    vector<vector<tuple<ll,ll,ll>>> edges(n);
    for (int i = 0; i < m; i++) {
        ll u,v,a,b;
        std::cin >> u>>v>>a>>b;
        u--;v--;
        edges[u].push_back({v,a,b});
        edges[v].push_back({u,a,b});
    }
    ll l = 0;
    ll r = 1e15;
    using P = pair<ll,ll>;
    while(r-l>1){
        ll m = (r+l)/2;
        
        vector<ll> dis(n,1e18);
        dis[0] = 0;
        
        priority_queue<P,vector<P>,greater<P>> pq;
        pq.push({0,0});
        while(!pq.empty()){
            auto [d, p] = pq.top();pq.pop();
            if(dis[p]<d)continue;
            for (auto e : edges[p]) {
                auto [v,a,b] = e;
                if(dis[v]>d+a&&b>=m){
                    dis[v] = d+a;
                    pq.push({dis[v], v});
                }
            }
        }
        if(dis[n-1]<=x){
            l = m;
        }else{
            r = m;
        }
    }
    if(l==0){
        std::cout << -1 << std::endl;
    }else{
        std::cout << l << std::endl;
    }
}