from heapq import heappush, heappop

INF = 10 ** 20

def dijkstra(s, N): # (始点, ノード数)
    dist = [(0, INF) for _ in range(N)]
    hq = [(-INF, 0, s)]
    dist[s] = (INF, 0)
    seen = set() # ノードが確定済みかどうか
    while hq:
        w, d, v = heappop(hq) # ノードを pop する
        if v==N-1:
            return -w
        for to, cost, width in G[v]: # ノード v に隣接しているノードに対して
            nw = max(w, -width)
            nd = d+cost
            if nd<=X and (nw, nd, to) not in seen:
                tw, td = dist[to]
                if tw<=nw and td<=nd:
                    continue
                dist[to] = (nw, nd)
                heappush(hq, (nw, nd, to))
                seen.add((nw, nd, to))
    return -1

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))

ans = dijkstra(0, N)
print(ans)