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

struct edge{
  int to;
  int c;
};

int main(){
  int n, m, k;
  cin >> n >> m >> k;
  
  vector<vector<edge>>g(n);
  for(int i = 0; i < m; i++){
    int u, v, c;
    cin >> u >> v >> c;
    u--, v--;
    g[u].push_back({v, c});
    g[v].push_back({u, c});
  }

  int ok = 300000, ng = -1;
  while(ok - ng >= 2){
    int mid = (ok + ng) / 2;
    deque<int>deq;
    vector<int>dist(n, 1e9);
    vector<bool>used(n);
    dist[0] = 0;
    deq.push_back(0);
    while(!deq.empty()){
      auto v = deq.front();
      deq.pop_front();
      if(used[v])continue;
      used[v] = true;
      for(auto e:g[v]){
        if(e.c > mid){
          if(dist[e.to] > dist[v] + 1){
            deq.push_back(e.to);
            dist[e.to] = dist[v] + 1;
          }
        }
        else if(dist[e.to] > dist[v]){
          deq.push_front(e.to);
          dist[e.to] = dist[v];
        }
      }
    }

    if(dist[n - 1] < k)ok = mid;
    else ng = mid;
  }

  cout << ok << endl;
}