N,M,K = map(int,input().split())
board = []
for _ in range(M):
    u,v,c = map(int,input().split())
    u-=1
    v-=1
    board.append((u,v,c))
from collections import deque
#edge[a].append((b,cost))
def bfs(st,dis,edge):
    q = deque()
    dis[st] = 0
    q.append((0,st))
    while q:
        t,now = q.popleft()
        if t > dis[now]:
            continue
        for next,cost in edge[now]:
            if dis[next] > cost + dis[now]:
                dis[next] = cost + dis[now]
                if cost == 0:
                    q.appendleft((dis[next],next))
                else:
                    q.append((dis[next],next))
def is_ok(x):
    edge = [[] for _ in range(N)]
    for i in range(M):
        u,v,c = board[i]
        if c > x:
            edge[u].append((v,1))
            edge[v].append((u,1))
        else:
            edge[u].append((v,0))
            edge[v].append((u,0))
    INF = float('inf')
    dis = [INF for _ in range(N)]
    bfs(0,dis,edge)
    if dis[N-1] <= K -1:
        return True
    else:
        return False

ok = 2 * 10 ** 5
ng = -1
while ok - ng > 1:
    x = (ng+ok)//2
    if is_ok(x):
        ok = x
    else:
        ng = x
print(ok)