import heapq

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

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

inf = 10 ** 20
def calc(k):
    
    dist = [inf] * N
    dist[0] = 0
    q = [(0,0)]
    while q:
        d,now = heapq.heappop(q)
        if dist[now] > d:continue
        if now == N - 1:break
        for v,a,b in G[now]:
            if b < k:continue
            if dist[v] > d + a:
                dist[v] = d + a
                heapq.heappush(q,(d + a,v))
    return dist[-1] <= X
end = 10 ** 9 + 1
start = 0
while end - start > 1:
    mid = end + start >> 1
    if calc(mid):
        start = mid
    else:
        end = mid
print(start if start != 0 else -1)