using System;
using System.Collections.Generic;
using System.Collections;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;
using static System.Math;
using System.Numerics;
using System.Threading;
using System.Runtime.CompilerServices;
static class Program{
	const int mod=(int)1e9+7;
	const int inf=int.MaxValue-1;
	static List<ValueTuple<int,int>>[] li;
	static void Main(){
		Sc sc=new Sc();
		var s=sc.Ia;
		int n=s[0],m=s[1],k=s[2];
		li=new List<ValueTuple<int,int>>[n+1];
		for(int i=1;i<=n;i++){li[i]=new List<ValueTuple<int,int>>();}
		for(int i=0;i<m;i++){
			var e=sc.Ia;
			li[e[0]].Add(ValueTuple.Create(e[1],e[2]));
			li[e[1]].Add(ValueTuple.Create(e[0],e[2]));
		}
		int lb = -1, ub = 200001, mid = 0;
		while(lb+1!=ub) {
			mid=(ub+lb)/2;
			if(Fb(mid)) { ub=mid; }
			else { lb=mid; }
		}
		Console.WriteLine("{0}",ub);
		bool Fb(int g) {
			var c=new int[n+1];
			for(int i = 2;i<=n;i++) {c[i]=inf;}
			var b=new bool[n+1];
			var qu=new Qu2<int>();
			qu.Enqueue0(1);
			while(qu.cnt>0){
				var e=qu.Dequeue;
				b[e.d]=true;
				for(int i = 0;i<li[e.d].Count;i++) {
					if(!b[li[e.d][i].Item1]){
						if(li[e.d][i].Item2<=g){
							if(c[li[e.d][i].Item1]>c[e.d]){
								c[li[e.d][i].Item1]=c[e.d];
								qu.Enqueue0(li[e.d][i].Item1);
							}
						}
						else{
							if(c[li[e.d][i].Item1]>c[e.d]+1){
								c[li[e.d][i].Item1]=c[e.d]+1;
								qu.Enqueue1(li[e.d][i].Item1);
							}
						}
					}
				}
			}
			return c[n]<k;
		}
	}
}
public class Qu2<T>{
	public class Dt{
		public bool b;
		public T d;
		public Dt(bool b,T d){this.b=b;this.d=d;}
		public override string ToString()=>"b:"+b.ToString()+" d:"+d.ToString();
	}
	private Queue<Dt> qu0=new Queue<Dt>(),qu1=new Queue<Dt>();
	public void Enqueue(bool b,T d){
		if(b){qu0.Enqueue(new Dt(true,d));}
		else{qu1.Enqueue(new Dt(false,d));}
	}
	public void Enqueue0(T d){qu0.Enqueue(new Dt(true,d));}
	public void Enqueue1(T d){qu1.Enqueue(new Dt(false,d));}
	public Dt Dequeue{get{return qu0.Count>0?qu0.Dequeue():qu1.Dequeue();}}
	public Dt Peek{get{return qu0.Count>0?qu0.Peek():qu1.Peek();}}
	public int cnt{get{return qu0.Count+qu1.Count;}}
}
public class Sc{
	public int I{get{return int.Parse(Console.ReadLine());}}
	public long L{get{return long.Parse(Console.ReadLine());}}
	public double D{get{return double.Parse(Console.ReadLine());}}
	public string S{get{return Console.ReadLine();}}
	public int[] Ia{get{return Array.ConvertAll(Console.ReadLine().Split(),int.Parse);}}
	public long[] La{get{return Array.ConvertAll(Console.ReadLine().Split(),long.Parse);}}
	public double[] Da{get{return Array.ConvertAll(Console.ReadLine().Split(),double.Parse);}}
	public string[] Sa{get{return Console.ReadLine().Split();}}
	public object[] Oa{get{return Console.ReadLine().Split();}}
	public int[] Ia2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),int.Parse);}}
	public int[] Ia3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),int.Parse);}
	public long[] La2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),long.Parse);}}
	public long[] La3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),long.Parse);}
	public double[] Da2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),double.Parse);}}
	public double[] Da3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),double.Parse);}
	public T[] Arr<T>(int n,Func<T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f();}return a;}
	public T[] Arr<T>(int n,Func<int,T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i);}return a;}
	public T[] Arr<T>(int n,Func<string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(Console.ReadLine().Split());}return a;}
	public T[] Arr<T>(int n,Func<int,string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i,Console.ReadLine().Split());}return a;}
}