import sys
sys.setrecursionlimit(5*10**5)
input = sys.stdin.readline
from collections import defaultdict, deque, Counter
from heapq import heappop, heappush
from bisect import bisect_left, bisect_right
from math import gcd

n,m,x = map(int,input().split())
graph = [[] for i in range(n+1)]
for i in range(m):
    a,b,c,d = map(int,input().split())
    graph[a].append((b,c,d))
    graph[b].append((a,c,d))
#ダイクストラ法
def dijkstra(s,n, W): # sがスタート、nが頂点数
    INF = 10**15
    dist = [INF]*(n+1)
    que = [(0,s)]
    dist[s] = 0
    while que:
        c,crr = heappop(que)
        if c > dist[crr]: continue
        if crr == n: break
        if c > x: break
        for nxt, time, width in graph[crr]:
            if width < W: continue
            if dist[crr] + time < dist[nxt]:
                dist[nxt] = dist[crr] + time
                heappush(que,(dist[nxt],nxt))
    return dist[-1]

l = 0
r = 10**9+1
for i in range(30):
    m = (l+r)//2
    t = dijkstra(1,n,m)
    if t <= x:
        l = m
    else:
        r = m

if dijkstra(1,n,l) <= x:
    print(l)
else:
    print(-1)