from heapq import heapify, heappush, heappop

n, c, v = map(int, (input() for _ in range(3)))
connections = [set() for _ in range(n + 1)]
for s, t, y, m in zip(*(map(int, input().split()) for _ in range(4))):
    connections[s].add((m, t, y))

queue = [(*con, c - con[2]) for con in connections[1] if con[2] <= c]
heapify(queue)
while queue:
    m, t, y, c = heappop(queue)
    if t == n:
        print(m)
        break
    for nm, nt, ny in connections[t]:
        if c < ny:
            continue
        heappush(queue, (m + nm, nt, ny, c - ny))
else:
    print(-1)