#include <bits/stdc++.h>
#define rep(i, a, b) for (ll i = (ll)(a); i < (ll)(b); i++)
using namespace std;

typedef long long ll;

template <typename T> struct Graph {

    struct edge {
        int to;
        T cost;
    };

    int n;
    vector<vector<edge>> gr;
    vector<T> dist;
    vector<int> prever;

    Graph(int n) : n(n) { init(); }
    T inf() { return numeric_limits<T>::max(); }
    T zero() { return T(); }

    void init() {
        gr.resize(n);
        dist.resize(n, inf());
    }
    void add_edge(int s, int t, T cost) { gr[s].emplace_back(edge{t, cost}); }
    void dijkstra(int s) {
        rep(i, 0, n) dist[i] = inf();
        prever = vector<int>(n, -1);
        dist[s] = zero();
        priority_queue<pair<T, int>, vector<pair<T, int>>,
                       greater<pair<T, int>>>
            q;
        q.push({zero(), s});
        while (!q.empty()) {
            int now;
            T nowdist;
            tie(nowdist, now) = q.top();
            q.pop();
            if (dist[now] < nowdist)
                continue;
            for (auto e : gr[now]) {
                T nextdist = nowdist + e.cost; // 次の頂点への距離
                if (dist[e.to] > nextdist) {
                    prever[e.to] = now;
                    dist[e.to] = nextdist;
                    q.push({dist[e.to], e.to});
                }
            }
        }
    }

    void bfs01(int s) {
        rep(i, 0, n) dist[i] = inf();
        prever = vector<int>(n, -1);
        dist[s] = zero();
        deque<int> q;
        q.push_back(s);
        while (!q.empty()) {
            int now = q.front();
            q.pop_front();
            for (auto e : gr[now]) {
                T nextdist = dist[now] + e.cost;
                if (dist[e.to] > nextdist) {
                    prever[e.to] = now;
                    dist[e.to] = nextdist;
                    if (e.cost == 0)
                        q.push_front(e.to);
                    else
                        q.push_back(e.to);
                }
            }
        }
    }

    vector<int> get_path(int t) { // tへの最短路構築
        if (dist[t] >= inf())
            return {-1};
        vector<int> path;
        for (; t != -1; t = prever[t]) {
            path.push_back(t);
        }
        reverse(path.begin(), path.end());
        return path;
    }
};

void solve() {
    int n, m, k;
    cin >> n >> m >> k;
    vector<int> u(m), v(m), c(m);
    rep(i, 0, m) {
        cin >> u[i] >> v[i] >> c[i];
        u[i]--, v[i]--;
    }
    auto check = [&](ll mid) { // ([...,1,1,1,0,0,0,...])
        Graph<int> gr(n);
        rep(i, 0, m) {
            if (c[i] > mid) {
                gr.add_edge(u[i], v[i], 1);
                gr.add_edge(v[i], u[i], 1);
            } else {
                gr.add_edge(u[i], v[i], 0);
                gr.add_edge(v[i], u[i], 0);
            }
        }
        gr.bfs01(0);
        return gr.dist[n - 1] >= k;
    };
    auto binary = [&]() {
        ll L = -1, R = 1;
        while (check(R))
            R *= 2;
        ll mid = L + (R - L) / 2;
        while (R - L > 1) {
            if (check(mid))
                L = mid;
            else
                R = mid;
            mid = L + (R - L) / 2;
        }
        return R;
    };
    cout << binary() << '\n';
}

int main() {
    cin.tie(0);
    cout.tie(0);
    ios::sync_with_stdio(0);
    solve();
}