import sys
input = sys.stdin.readline

from heapq import heappop,heappush

N,M,X=map(int,input().split())

E=[[] for i in range(N+1)]

for i in range(M):
    u,v,a,b=map(int,input().split())
    E[u].append((v,a,b))
    E[v].append((u,a,b))

def calc(NG):

    DIS=[1<<63]*(N+1)
    DIS[1]=0
    Q=[(0,1)]

    while Q:
        now,ind=heappop(Q)

        if DIS[ind]!=now:
            continue

        for to,dis,b in E[ind]:
            if b<NG:
                continue

            if DIS[to]>now+dis:
                DIS[to]=now+dis
                heappush(Q,(DIS[to],to))

    return DIS[N]

if calc(0)>X:
    print(-1)
else:
    OK=0
    NG=10**18+1

    while NG>OK+1:
        mid=(OK+NG)//2

        x=calc(mid)

        if x>X:
            NG=mid
        else:
            OK=mid

    print(OK)