#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <cmath>
#include <bitset>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <algorithm>
#include <complex>
#include <unordered_map>
#include <unordered_set>
#include <random>
#include <cassert>
#include <fstream>
#include <utility>
#include <functional>
#include <time.h>
#include <stack>
#include <array>
#include <list>
#include <atcoder/all>
#define popcount __builtin_popcount
using namespace std;
using namespace atcoder;
typedef long long ll;
typedef pair<int, int> P;

int main()
{
    int n, m, k; cin>>n>>m>>k;
    vector<P> g[200020];
    for(int i=0; i<m; i++){
        int u, v; cin>>u>>v; u--; v--;
        int c; cin>>c;
        g[u].push_back({v, c});
        g[v].push_back({u, c});
    }
    const int INF=1e9;
    int l=-1, r=2e5+1;
    while(r-l>1){
        int mid=(l+r)/2;
        int d[200020];
        fill(d, d+n, INF);
        d[0]=0;
        deque<int> que;
        que.push_back(0);
        while(!que.empty()){
            int x=que.front(); que.pop_front();
            for(auto q:g[x]){
                int y=q.first;
                if(q.second>mid){
                    if(d[y]>d[x]+1){
                        d[y]=d[x]+1;
                        que.push_back(y);
                    }
                }else{
                    if(d[y]>d[x]){
                        d[y]=d[x];
                        que.push_front(y);
                    }
                }
            }
        }
        if(d[n-1]<k) r=mid;
        else l=mid;
    }
    cout<<r<<endl;
    return 0;
}