#include <bits/stdc++.h>
using namespace std;

int main() {
    int N,M,K;
    cin >> N >> M >> K;
    vector<int>u(M),v(M),c(M);
    vector<vector<pair<int,int>>>road(N);
    for(int i = 0; i < M; i++) {
        cin >> u[i] >> v[i] >> c[i];
        u[i]--;
        v[i]--;
        road[u[i]].push_back({v[i],c[i]});
        road[v[i]].push_back({u[i],c[i]});
    }
    int l = -1,r = 200000;
    while (l+1 < r) {
        int mid = (l+r)/2;
        vector<int>dist(N,1001001001);
        dist[0] = 0;
        deque<int>que;
        que.push_front(0);
        while (!que.empty()) {
            int x = que.front();
            que.pop_front();
            for(int i = 0; i < road[x].size(); i++) {
                if(road[x][i].second > mid) {
                    if(dist[road[x][i].first] > dist[x]+1) {
                        dist[road[x][i].first] = dist[x]+1;
                        que.push_back({road[x][i].first});
                    }
                }
                else {
                    if(dist[road[x][i].first] > dist[x]) {
                        dist[road[x][i].first] = dist[x];
                        que.push_front({road[x][i].first});
                    }
                }
            }
        }
        if(dist[N-1] < K) {
            r = mid;
        }
        else {
            l = mid;
        }
    }
    cout << r << endl;
}