import math
import queue

class Node:
    def __init__(self):
        self.index=None
        self.cost=0
        self.minute=math.inf
        self.edges_to=[]
        self.edges_cost=[]
        self.edges_minute=[]
        self. done=False
    def __lt__(self,opr):
        return self.minute < opr.minute

n=int(input())
c=int(input())
v=int(input())
s=[int(i) for i in input().split()]
t=[int(i) for i in input().split()]
y=[int(i) for i in input().split()]
m=[int(i) for i in input().split()]

nodes=[Node() for i in range(n)]

for i in range(len(s)):
    nodes[s[i]-1].edges_to.append(t[i]-1)
    nodes[s[i]-1].edges_cost.append(y[i])
    nodes[s[i]-1].edges_minute.append(m[i])

nodes[0].minute=0

for i in range(n):
    nodes[i].index=i

def fun(index,cost):
    if cost<0:
        return math.inf

    if index==n-1:
        return 0

    mini=math.inf
    for to in range(len(nodes[index].edges_to)):
        mini=min(fun(nodes[index].edges_to[to],cost-nodes[index].edges_cost[to])+nodes[index].edges_minute[to],mini)
    return mini

sum=fun(0,c)
print(-1 if sum==math.inf else sum)