from heapq import heappop, heappush, heapify


def main():
    N = int(input())
    C = int(input())
    V = int(input())
    S = list(map(int, input().split()))
    T = list(map(int, input().split()))
    Y = list(map(int, input().split()))  # money
    M = list(map(int, input().split()))  # time

    MAP = [[] for n in range(N)]

    for v in range(V):
        MAP[S[v]-1].append((M[v], Y[v], T[v]-1))

    m_cost = 0
    t_cost = 0
    Q = [(0, 0, 0)]  # time_cost, money_cost, point
    tcosts = [float("inf")] * N  # time cost map
    mcosts = [float("inf")] * N  # time cost map
    R = [False] * N  # reached

    while len(Q) > 0:
        t_cost, m_cost, point = heappop(Q)
        if point == N-1:
            print(t_cost)
            return

        for n in MAP[point]:
            new_tcost = t_cost + n[0]
            new_mcost = m_cost + n[1]
            new_point = n[2]
            if m_cost + n[1] > C:
                continue
            if new_tcost < tcosts[new_point] or new_mcost < mcosts[new_point]:
                heappush(Q, (new_tcost, new_mcost, new_point))
                tcosts[point] = new_tcost
                mcosts[point] = new_mcost

    print(-1)


if __name__ == "__main__":
    main()