#pragma GCC optimize("O3")
#include<bits/stdc++.h> 
using namespace std;
using ll=long long;
using P=pair<ll,ll>;
template<class T> using V=vector<T>; 
#define fi first
#define se second
#define all(v) (v).begin(),(v).end()
const ll inf=(1e18);
//const ll mod=998244353;
const ll mod=1000000007;
const vector<int> dy={-1,0,1,0},dx={0,-1,0,1};
ll GCD(ll a,ll b) {return b ? GCD(b,a%b):a;}
ll LCM(ll c,ll d){return c/GCD(c,d)*d;}
struct __INIT{__INIT(){cin.tie(0);ios::sync_with_stdio(false);cout<<fixed<<setprecision(20);}} __init;
template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }
template<class T>void debag(const vector<T> &a){cerr<<"debag :";for(auto v:a)cerr<<v<<" ";cerr<<"\n";}
template<class T>void print(const vector<T> &a){for(auto v:a)cout<<v<<" ";cout<<"\n";}
struct edge{
      int to,cost;
      edge(int to,int cost):to(to),cost(cost){}
};
int main(){
      int n,m,k;
      cin>>n>>m>>k;
      V<V<edge>> g(n);
      for(int i=0;i<m;i++){
            int a,b,c;
            cin>>a>>b>>c;
            --a;--b;
            g[a].emplace_back(b,c);
            g[b].emplace_back(a,c);
      }
      auto f=[&](ll mid)->int{
            deque<P> deq;
            V<int> dp(n,n+5);
            dp[0]=0;
            deq.emplace_back(0,0);
            while(deq.size()){
                  auto [v,cur]=deq.front();
                  deq.pop_front();
                  if(dp[cur]<v)continue;
                  for(edge &e:g[cur]){
                        if(e.cost<mid&&chmin(dp[e.to],dp[cur])){
                              deq.emplace_front(dp[e.to],e.to);
                        }
                        if(e.cost>=mid&&chmin(dp[e.to],dp[cur]+1)){
                              deq.emplace_back(dp[e.to],e.to);
                        }
                  }
            }
            return dp[n-1];
      };
      ll l=0,r=200005;
      while(r-l>1){
            ll mid=(l+r)/2;
            if(f(mid)>=k)l=mid;
            else r=mid;
      }
     cout<<l<<"\n";
}