#include <stdio.h>
#include <stdlib.h>
int N, C, V;
int M_min = 0;
struct route { int S; int T; int Y; int M; };
struct route *Route;
struct town { int route_n; int *route; };
struct town *Town;
void go(int no, int Y, int M)
{
  if (no == N) {
    M_min = M;
  } else {
    int i;
    struct town *townp = &(Town[no - 1]);
    for (i=0; i<townp->route_n; i++) {
      struct route *routep = &(Route[townp->route[i]]);
      int YY = Y + routep->Y;
      int MM = M + routep->M;
      if (YY <= C && MM < M_min) {
        go(routep->T, YY, MM);
      }
    }
  }
  return;
}
int main()
{
  int i;
  scanf("%d", &N);
  scanf("%d", &C);
  scanf("%d", &V);
  Route = (struct route*)malloc(sizeof(struct route)*V);
  for (i=0; i<V; i++) scanf("%d", &(Route[i].S));
  for (i=0; i<V; i++) scanf("%d", &(Route[i].T));
  for (i=0; i<V; i++) scanf("%d", &(Route[i].Y));
  for (i=0; i<V; i++) scanf("%d", &(Route[i].M));

  for (i=0; i<V; i++) M_min += Route[i].M;
  M_min++;
  int check = M_min;

  Town = (struct town*)malloc(sizeof(struct town)*N);
  struct town *townp = Town;
  for (i=0; i<N; i++) {
    townp->route = (int*)malloc(sizeof(int)*V);
    townp->route_n = 0;
    townp++;
  }
  for (i=0; i<V; i++) {
    townp = &(Town[Route[i].S - 1]);
    townp->route[townp->route_n] = i;
    townp->route_n++;
  }

  go(1, 0, 0);

  if (check == M_min) {
    printf("%d\n", -1);
  } else {
    printf("%d\n", M_min);
  }
  return 0;
}