#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using P=pair<ll,ll>;
using T=tuple<ll,ll,ll>;

int main(){
  ll n,m,x;
  cin>>n>>m>>x;
  vector<vector<T>> G(n);
  for(ll i=0;i<m;i++){
    ll u,v,a,b;
    cin>>u>>v>>a>>b;
    u--;
    v--;
    G[u].push_back(T(v,a,b));
    G[v].push_back(T(u,a,b));
  }
  ll ok=0,ng=1e18;
  while(abs(ok-ng)>1){
    ll mid=(ok+ng)/2;
    vector<ll> dist(n,1e18);
    dist[0]=0;
    priority_queue<P,vector<P>,greater<P>> que;
    que.push(P(dist[0],0));
    while(que.size()){
      P q=que.top();
      que.pop();
      ll num1=q.first;
      ll num2=q.second;
      if(dist[num2]<num1){
        continue;
      }
      for(T u:G[num2]){
        ll num3=get<0>(u);
        ll num4=get<1>(u);
        ll num5=get<2>(u);
        if(num5>=mid&&dist[num3]>dist[num2]+num4){
          dist[num3]=dist[num2]+num4;
          que.push(P(dist[num3],num3));
        }
      }
    }
    if(dist[n-1]<=x){
      ok=mid;
    }else{
      ng=mid;
    }
  }
  if(ok>0){
    cout<<ok<<endl;
  }else{
    cout<<-1<<endl;
  }
}