#include<bits/stdc++.h>

using namespace std;

#define Rabbir_Reaper ios_base::sync_with_stdio(0); cin.tie(0);

int find(int x,vector<int> &boss){

    if(boss[x] < 0) return x;

    return boss[x] = find(boss[x],boss);

}

vector<vector<int>> adj;

int main(){

    Rabbir_Reaper

    int m,n,k,_k;

    cin>>n>>m;

    _k = n;

    vector<int> boss(n+1,-1);

    for(int i=0,a,b,c;i<m;i++){

        cin>>a>>b>>c;

        adj.push_back({c,a,b});

    }

    cin>>k;

    sort(adj.begin(),adj.end());

    for(int i=0;i<adj.size();i++){

        int u = find(adj[i][1],boss);

        int v = find(adj[i][2],boss);

        if(u != v){

            _k--;

            if(boss[u] > boss[v]) swap(u,v);

            boss[u] += boss[v];

            boss[v] = u;

            if(_k < k){

                cout<<adj[i][0];

                return 0;

            }

        }

    }

}