import sys
input = sys.stdin.readline
from heapq import heappush,heappop
INF=1<<60
N,M,X=map(int,input().split())
UVAB=[list(map(int,input().split())) for _ in range(M)]
edge = [[] for _ in range(N)]
for u,v,a,b in UVAB:
    u-=1;v-=1
    edge[u].append((v,a,b))
    edge[v].append((u,a,b))

def check(B):
    time = [INF]*N
    time[0]=0
    que = [(0,0)]
    while que:
        x,v = heappop(que)
        if time[v]<x:continue
        for to,a,b in edge[v]:
            if b<B:continue
            x2 = x+a
            if x2 >= time[to]:continue
            time[to]=x2
            heappush(que, (x2,to))
        if time[-1]<=X:return True
    return False

ok,ng=-1,10**9+1
while ok+1<ng:
    m = ok+ng>>1
    if check(m):
        ok=m
    else:
        ng=m
print(ok)