#include<bits/stdc++.h>
using namespace std;
#define ALL(x) begin(x),end(x)
#define rep(i,n) for(int i=0;i<(n);i++)
#define debug(v) cout<<#v<<":";for(auto x:v){cout<<x<<' ';}cout<<endl;
#define mod 1000000007
using ll=long long;
const int INF=1000000000;
const ll LINF=1001002003004005006ll;
int dx[]={1,0,-1,0},dy[]={0,1,0,-1};
// ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
template<class T>bool chmax(T &a,const T &b){if(a<b){a=b;return true;}return false;}
template<class T>bool chmin(T &a,const T &b){if(b<a){a=b;return true;}return false;}

struct IOSetup{
    IOSetup(){
        cin.tie(0);
        ios::sync_with_stdio(0);
        cout<<fixed<<setprecision(12);
    }
} iosetup;

template<typename T>
ostream &operator<<(ostream &os,const vector<T>&v){
    for(int i=0;i<(int)v.size();i++) os<<v[i]<<(i+1==(int)v.size()?"":" ");
    return os;
}
template<typename T>
istream &operator>>(istream &is,vector<T>&v){
    for(T &x:v)is>>x;
    return is;
}

// graph template
// ref : https://ei1333.github.io/library/graph/graph-template.cpp
template<typename T=int>
struct Edge{
    int from,to;
    T w;
    int idx;
    Edge()=default;
    Edge(int from,int to,T w=1,int idx=-1):from(from),to(to),w(w),idx(idx){}
    operator int() const{return to;}
};

template<typename T=int>
struct Graph{
    vector<vector<Edge<T>>> g;
    int V,E;
    Graph()=default;
    Graph(int n):g(n),V(n),E(0){}

    int size(){
        return (int)g.size();
    }
    void resize(int k){
        g.resize(k);
        V=k;
    }
    inline const vector<Edge<T>> &operator[](int k)const{
        return (g.at(k));
    }
    inline vector<Edge<T>> &operator[](int k){
        return (g.at(k));
    }
    void add_directed_edge(int from,int to,T cost=1){
        g[from].emplace_back(from,to,cost,E++);
    }
    void add_edge(int from,int to,T cost=1){
        g[from].emplace_back(from,to,cost,E);
        g[to].emplace_back(to,from,cost,E++);
    }
    void read(int m,int pad=-1,bool weighted=false,bool directed=false){
        for(int i=0;i<m;i++){
            int u,v;cin>>u>>v;
            u+=pad,v+=pad;
            T w=T(1);
            if(weighted) cin>>w;
            if(directed) add_directed_edge(u,v,w);
            else         add_edge(u,v,w);
        }
    }
};

signed main(){
    int N,M,K;cin>>N>>M>>K;
    Graph<int> G(N);
    vector<int> W;
    rep(i,M){
        int u,v,c;cin>>u>>v>>c;u--,v--;
        W.push_back(c);
        G.add_edge(u,v,c);
    }

    sort(ALL(W));
    W.erase(unique(ALL(W)),end(W));

    using P=pair<int,int>;
    auto check=[&](int idx){
        int X=W[idx];
        vector<int> dp(N,INF);
        dp[0]=0;

        priority_queue<P,vector<P>,greater<P>> que;
        que.emplace(dp[0],0);
        while(!que.empty()){
            auto [cur,d]=que.top();que.pop();
            if(dp[cur]<d) continue;

            for(auto &e:G[cur]){
                int nxtd=d+(e.w>X);
                if(chmin(dp[e],nxtd)) que.emplace(e,nxtd);
            }
        }

        return dp[N-1]<K;
    };

    int lw=0,hi=(int)W.size()-1,res=INF;
    while(lw<=hi){
        int mid=(lw+hi)/2;
        if(check(mid)) res=mid,hi=mid-1;
        else           lw=mid+1;
    }
    cout<<res<<endl;
    return 0;
}