# coding: utf-8
# Your code here!
import heapq as hq

def dijkstra(edges,start,size):
    n_node=len(edges)
    costs=[float("inf") for i in range(n_node)]
    
    
    queue=[[0,start]]
    
    while queue:
        cost,now=hq.heappop(queue)
        if costs[now]>cost:
            costs[now]=cost
            for n_cost,width,nxt in edges[now]:
                if width>=size:
                    hq.heappush(queue,[cost+n_cost,nxt])
 
    return costs[:]

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

edges=[[] for i in range(N)]

for _ in range(M):
    u,v,a,b=map(int,input().split())
    edges[u-1].append([a,b,v-1])
    edges[v-1].append([a,b,u-1])
    

high=10**9+1
low=-1

while high-low>1:
    middle=(high+low)//2
    
    costs=dijkstra(edges[:],0,middle)
    
    if costs[-1]<=X:
        low=middle
    else:
        high=middle


print(low)