import sys
import io, os
input = io.BytesIO(os.read(0,os.fstat(0).st_size)).readline

from collections import deque
INF = 10**18

def main():
    n, m, k = map(int, input().split())
    edge = [[] for i in range(n)]
    for i in range(m):
        u, v, c = map(int, input().split())
        u, v = u-1, v-1
        edge[u].append((c, v))
        edge[v].append((c, u))


    def bfs(s, edge, x):
        q = deque([])
        q.append(0)
        dist = [INF]*n
        dist[0] = 0
        while q:
            v = q.popleft()
            if v == n-1:
                return dist[n-1]
            for w, nv in edge[v]:
                if w > x:
                    c = 1
                else:
                    c = 0
                if dist[v]+c < dist[nv]:
                    dist[nv] = dist[v]+c
                    if c == 0:
                        q.appendleft(nv)
                    else:
                        q.append(nv)

    def is_ok(x):
        d = bfs(0, edge, x)
        return d < k

    ng = -1
    ok = 2*10**5+50
    while ng+1 < ok:
        mid = (ng+ok)//2
        if is_ok(mid):
            ok = mid
        else:
            ng = mid
    print(ok)

if __name__ == '__main__':
    main()