n = int(input())
c = int(input())
a = int(input())
S = list(map(int, input().split()))
T = list(map(int, input().split()))
Y = list(map(int, input().split()))
M = list(map(int, input().split()))

edge = [[] for i in range(n)]
for i in range(a):
    s, t, y, m = S[i], T[i], Y[i], M[i]
    s, t = s-1, t-1
    edge[s].append((y, m, t))
    edge[t].append((y, m, s))

INF = 10**18
import heapq
hq = [(0, 0, 0)]
heapq.heapify(hq)
while hq:
    time, cost, v = heapq.heappop(hq)
    if v == n-1:
        print(time)
        exit()
    for y, m, u in edge[v]:
        if cost+y <= c:
            heapq.heappush(hq, (time+m, cost+y, u))
print(-1)