import java.io.BufferedReader
import java.io.InputStream
import java.io.InputStreamReader
import java.lang.AssertionError
import java.util.*
import kotlin.math.abs
import kotlin.math.max
import kotlin.math.min

val MOD = 1_000_000_007

/**
 * 単調増加
 * (l, h] 方式
 * @return マッチするものがなかったらmx
 */
inline fun findMin(mn: Int, mx: Int, f: (Int) -> Boolean): Int {
  var low = mn - 1
  var high = mx
  while(high - low > 1) {
    val m = (low + high) / 2
    if (f(m)) high = m
    else low = m
  }
  return high
}
data class Edge(val v: Int, val u: Int, val c: Int, var weight: Int)
class Solver(stream: InputStream, private val out: java.io.PrintWriter) {
  private val reader = BufferedReader(InputStreamReader(stream), 32768)

  private val N = ni()
  private val M = ni()
  private val K = ni()
  private val D = IntArray(N)
  private val g = Array(N){ mutableListOf<Edge>()}
  val inf = 1e9.toInt() + 100
  fun dijk(g: Array<MutableList<Edge>>, s: Int): IntArray {
    D.fill(inf)
    D[s] = 0
    val que = ArrayDeque<Int>()
    que.add(s)
    while(que.isNotEmpty()) {
      val v = que.poll()!!

      for (i in 0 until g[v].size) {
        val e = g[v][i]
        if (D[v] + e.weight < D[e.u]) {
          D[e.u] = D[v] + e.weight
          if (e.weight == 0) que.addFirst(e.u) else que.addLast(e.u)
        }
      }
    }
    return D
  }

  fun solve() {
    for (i in 0 until M) {
      val (v, u) = na(2, -1)
      val c = ni()
      g[v].add(Edge(v, u, c, -1))
      g[u].add(Edge(u, v, c, -1))
    }

    fun calc(x: Int): IntArray {
      for (i in 0 until N) {
        for (j in g[i].indices) {
          val e = g[i][j]
          e.weight = if (e.c > x) 1 else 0
        }
      }

      return dijk(g, 0)
    }

    // K進むことなくNに到達できる
    if (calc(0)[N - 1] < K) {
      out.println(0)
      return
    }

    val ans = findMin(1, 200_000) { x ->
      val D = calc(x)
      D[N - 1] <= K - 1
    }

    out.println(ans)
  }













































  private val isDebug = try {
    // なんか本番でエラーでる
    System.getenv("MY_DEBUG") != null
  } catch (t: Throwable) {
    false
  }

  private var tokenizer: StringTokenizer? = null
  private fun next(): String {
    while (tokenizer == null || !tokenizer!!.hasMoreTokens()) {
      tokenizer = StringTokenizer(reader.readLine())
    }
    return tokenizer!!.nextToken()
  }

  private fun ni() = next().toInt()
  private fun nl() = next().toLong()
  private fun ns() = next()
  private fun na(n: Int, offset: Int = 0): IntArray {
    return IntArray(n) { ni() + offset }
  }
  private fun nal(n: Int, offset: Int = 0): LongArray {
    val res = LongArray(n)
    for (i in 0 until n) {
      res[i] = nl() + offset
    }
    return res
  }

  private fun na2(n: Int, offset: Int = 0): Array<IntArray> {
    val a  = Array(2){IntArray(n)}
    for (i in 0 until n) {
      for (e in a) {
        e[i] = ni() + offset
      }
    }
    return a
  }

  private inline fun debug(msg: () -> String) {
    if (isDebug) System.err.println(msg())
  }

  /**
   * コーナーケースでエラー出たりするので、debug(dp[1])のように添え字付きの場合はdebug{}をつかうこと
   */
  private inline fun debug(a: LongArray) {
    debug { a.joinToString(" ") }
  }

  private inline fun debug(a: IntArray) {
    debug { a.joinToString(" ") }
  }

  private inline fun debug(a: BooleanArray) {
    debug { toString(a) }
  }

  private inline fun toString(a: BooleanArray) = run{a.map { if (it) 1 else 0 }.joinToString("")}

  private inline fun debugDim(A: Array<LongArray>) {
    if (isDebug) {
      for (a in A) {
        debug(a)
      }
    }
  }
  private inline fun debugDim(A: Array<IntArray>) {
    if (isDebug) {
      for (a in A) {
        debug(a)
      }
    }
  }
  private inline fun debugDim(A: Array<BooleanArray>) {
    if (isDebug) {
      for (a in A) {
        debug(a)
      }
    }
  }

  /**
   * 勝手にimport消されるのを防ぎたい
   */
  private fun hoge() {
    min(1, 2)
    max(1, 2)
    abs(-10)
  }

  private inline fun assert(b: Boolean) = run{if (!b) throw AssertionError()}
  private inline fun assert(b: Boolean, f: () -> String) = run{if (!b) throw AssertionError(f())}
}

fun main() {
  val out = java.io.PrintWriter(System.out)
  Solver(System.`in`, out).solve()
  out.flush()
}