from heapq import heappop,heappush
n,m,x = map(int,input().split())
adj = [[] for _ in range(n)]
for _ in range(m):
    u,v,a,b = map(int,input().split())
    adj[u-1].append((v-1,a,b))
    adj[v-1].append((u-1,a,b))
ok = -1; ng = 10**9+1
while ng-ok>1:
    mid = (ok+ng)//2
    t = [0]+[10**18+1]*(n-1); f = [False]*n; hq = [(0,0)]
    while hq:
        d,p = heappop(hq)
        if f[p]: continue
        f[p] = True
        for c,a,b in adj[p]:
            if b>=mid and t[c]>d+a: t[c] = d+a; heappush(hq,(t[c],c))
    if t[n-1]<=x: ok = mid
    else: ng = mid
print(ok)