import heapq
import sys
rr = sys.stdin
N,M,X = map(int,rr.readline().split())
BB = 0
G = [[] for _ in range(N)]
for _ in range(M):
    u,v,a,b = map(int,rr.readline().split())
    u -= 1
    v -= 1
    if BB < b:BB = b
    G[u].append((b,a,v))
    G[v].append((b,a,u))
for i in range(N):
    G[i].sort(reverse = True)
X = min(X,10 ** 14)
inf = 1 << 50
B = 47
mask = (1 << B) - 1
def calc(k):
    
    dist = [inf] * N
    dist[0] = 0
    q = [0]
    while q:
        U = heapq.heappop(q)
        d = U >> B
        now = U & mask
        if dist[now] > d:continue
        if now == N - 1:break
        for b,a,v in G[now]:
            if b < k:break
            if dist[v] > d + a:
                dist[v] = d + a
                heapq.heappush(q,((d + a) << B) + v)
    return dist[-1] <= X
end = BB + 1
start = 0
while end - start > 1:
    mid = end + start >> 1
    k = mid
    dist = [inf] * N
    dist[0] = 0
    q = [0]
    while q:
        U = heapq.heappop(q)
        d = U >> B
        now = U & mask
        if dist[now] > d:continue
        if now == N - 1:break
        for b,a,v in G[now]:
            if b < k:continue
            if dist[v] > d + a:
                dist[v] = d + a
                heapq.heappush(q,((d + a) << B) + v)
    if  dist[-1] <= X:
        start = mid
    else:
        end = mid
    """
    if calc(mid):
        start = mid
    else:
        end = mid
    """
print(start if start != 0 else -1)