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())
    E = []
    for i in range(m):
        u, v, c = map(int, input().split())
        u, v = u-1, v-1
        E.append((u, v, c))


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

    def is_ok(x):
        edge = [[] for i in range(n)]
        for u, v, c in E:
            if c > x:
                edge[u].append((1, v))
                edge[v].append((1, u))
            else:
                edge[u].append((0, v))
                edge[v].append((0, u))
        dist = bfs(0, edge)
        return dist[n-1] < 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()