# import pypyjit;pypyjit.set_param("max_unroll_recursion=-1")
# from bisect import *
from collections import *
from heapq import *

# from itertools import *
# from math import *
# from datetime import *
# from decimal import *  # PyPyだと遅い
# from string import ascii_lowercase,ascii_uppercase
# import numpy as np
import sys

# sys.setrecursionlimit(10**6) # PyPyだと遅い
INF = 10**20
MOD = 998244353
# MOD = 10**9 + 7
File = sys.stdin


def input():
    return File.readline()[:-1]


# ///////////////////////////////////////////////////////////////////////////


def Dijkstra(G, num_nodes, start_node, arg):
    heap = [(0, start_node, INF)]
    dist = [INF] * num_nodes
    dist[start_node] = 0
    flag = [False] * num_nodes
    cnt = 0

    for _ in range(INF):
        if len(heap) == 0:
            break
        popV = heappop(heap)
        if flag[popV[1]]:
            continue

        for i in G[popV[1]]:
            if i[2] < arg:
                continue
            dist[i[1]] = min(dist[i[1]], popV[0] + i[0])
            heappush(heap, (dist[i[1]], i[1]))
        flag[popV[1]] = True
        cnt += 1
        if cnt == num_nodes:
            break

    return dist[-1]


# 最大
def is_ok(arg):
    return Dijkstra(G, N, 0, arg) < X


def meguru_bisect(ng, ok):
    """
    初期値のng,okを受け取り,is_okを満たす最小(最大)のokを返す
    まずis_okを定義すべし
    ng ok は  とり得る最小の値-1 とり得る最大の値+1
    最大最小が逆の場合はよしなにひっくり返す
    """
    for _ in range(10**18):
        if not abs(ng - ok) > 1:
            break
        mid = (ng + ok) // 2
        if is_ok(mid):
            ng = mid
        else:
            ok = mid
    return ng


N, M, X = map(int, input().split())
roads = [list(map(int, input().split())) for _ in range(M)]

G = defaultdict(set)

for u, v, a, b in roads:
    G[u - 1].add((a, v - 1, b))
    G[v - 1].add((a, u - 1, b))

print(meguru_bisect(-1, INF))