#include <iostream>
#include <vector>
#include <cmath>
#include <map>
#include <set>
#include <iomanip>
#include <queue>
#include <algorithm>
#include <numeric>
#include <deque>
#include <complex>
#include <cassert>

using namespace std;

template<typename T> using pq = priority_queue<T, vector<T>, greater<T>>;
using ll = long long;

ll N, M, K;
vector<ll> u, v, c;

bool solve(ll X){
 
    long long A, B, C, start;
    long long from, alt, d;
    pq<pair<long long, long long>> que;
    vector<vector<pair<long long, long long>>> E(N);
    vector<long long> dist(N, 1e18);
    vector<bool> visit(N);
 
    for (int i=0; i < M; i++){
        A = u[i]; B = v[i];
        C = (c[i] > X ? 1 : 0);
        E[A].push_back({B, C});
        E[B].push_back({A, C});
    }
 
    dist[0] = 0;
    que.push({0, 0});
 
    while(!que.empty()){
        tie(d, from) = que.top();
        que.pop();
        if (visit[from]) continue;
        visit[from] = 1;
        for (auto [to, C] : E[from]){
            alt = d + C;
            if (alt < dist[to]){
                dist[to] = alt;
                que.push({dist[to], to});
            }
        }
    }

    return dist[N-1] < K;
}

int main(){
    cin >> N >> M >> K;
    u.resize(M); v.resize(M); c.resize(M);
    for (int i=0; i<M; i++){
        cin >> u[i] >> v[i] >> c[i];
        u[i]--; v[i]--;
    }

    ll l=-1, r=2e5, c;
    while(r-l>1){
        c = (l+r)/2;
        if (solve(c)) r=c;
        else l=c;
    }

    cout << r << endl;
}