import heapq
n, m, x = map(int, input().split())
e = [[] for _ in range(n)]
for _ in range(m):
  u, v, a, b = map(int, input().split())
  u -= 1
  v -= 1
  e[u].append([v, a, b])
  e[v].append([u, a, b])
l, r = -1, 1 << 30
while r - l > 1:
  piv = (l + r) // 2
  dist = [1 << 60] * n
  dist[0] = 0
  h = [0]
  while h:
    tmp = heapq.heappop(h)
    d, u = divmod(tmp, n)
    if d > x:
      break
    if u == n:
      break
    if dist[u] < d:
      continue
    for v, a, b in e[u]:
      if b < piv:
        continue
      if d + a < dist[v]:
        dist[v] = d + a
        heapq.heappush(h, dist[v]*n+v)
  if dist[-1] <= x:
    l = piv
  else:
    r = piv
print(l)