#include<bits/stdc++.h>

using namespace std;
typedef long long ll;
struct node{
    int u,v;
    ll a,b;
};
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n,m;
    ll X;
    cin >> n >> m >> X;
    std::vector<node> a(m);
    for(int i = 0;i < m;i ++){
        cin >> a[i].u >> a[i].v >> a[i].a >> a[i].b;
    }
    auto check = [&](int x)->bool{
        std::vector<std::vector<pair<int,ll>>> e;
        e.resize(n + 1);
        for(int i = 0;i < m;i ++){
            if(a[i].b >= x){
                e[a[i].u].push_back({a[i].v,a[i].a});
                e[a[i].v].push_back({a[i].u,a[i].a});
            }
        }
        vector<ll> dis(n + 1,1e18 + 7);
        std::vector<int> vis(n + 1);
        priority_queue<pair<ll,int>> q;
        dis[1] = 0;
        q.push({dis[1],1});
        while(!q.empty()){
            int u = q.top().second;
            q.pop();
            if(vis[u])continue;
            vis[u] = 1;
            for(auto [v,w]:e[u]){
                if(dis[v] > dis[u] + w){
                    dis[v] = dis[u] + w;
                    q.push({-dis[v],v});
                }
            }
        }
        if(dis[n] < X){
            return true;
        }return false;
    };
    int l = 0,r = 1e9,ans = -1;
    while(l <= r){
        int mid = l + r >> 1;
        if(check(mid)){
            l = mid + 1;
            ans = mid;
        }else r = mid - 1;
    }
    cout << ans << "\n";
    return 0;
}