#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i,n)for (int i = 0; i < int(n); ++i)
#define rrep(i,n)for (int i = int(n)-1; i >= 0; --i)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
template<class T> void chmax(T& a, const T& b) {a = max(a, b);}
template<class T> void chmin(T& a, const T& b) {a = min(a, b);}
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

template<class T>
std::vector<unsigned long long> dijkstra(std::vector<std::vector<std::pair<int,T>>>& to, int s=0) {
    const unsigned long long INF = 1002003004005006007;
    struct QueElem {
        int v;
        unsigned long long c;
        bool operator<(const QueElem a) const {return c > a.c;}
        QueElem(int v, unsigned long long c): v(v), c(c) {}
    };
    std::priority_queue<QueElem> q;
    std::vector<unsigned long long> dist(to.size(), INF);
    dist[s] = 0;
    q.emplace(s, 0);
    while(!q.empty()) {
        QueElem qe = q.top(); q.pop();
        int u = qe.v;
        unsigned long long c = qe.c;
        if (c > dist[u]) continue;
        for(auto vc: to[u]) {
            int v = vc.first;
            unsigned long long nc = c + vc.second;
            if (nc < dist[v]) {
                dist[v] = nc;
                q.emplace(v, nc);
            }
        }
    }
    return dist;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, m, k;
    cin >> n >> m >> k;
    vector<vector<P>> graph(n);
    rep(_, m) {
        int u, v, c;
        cin >> u >> v >> c;
        --u, --v;
        graph[u].emplace_back(v, c);
        graph[v].emplace_back(u, c);
    }
    int l = -1, r = 2 * 100000;
    while(r - l > 1) {
        int c = r + l >> 1;
        vector<vector<P>> to(n);
        rep(u, n) for(auto [v, d]: graph[u]) {
            if (d > c) to[u].emplace_back(v, 1);
            else to[u].emplace_back(v, 0);
        }
        auto dist = dijkstra(to);
        if (dist[n - 1] < k) r = c;
        else l = c;
    }
    cout << r << endl;
}