l=lambda:map(int,raw_input().split())
n=input()
c=input()
v=input()
s=l()
t=l()
y=l()
m=l()
r=[(0,0,[1])]
g=[]
while len(r)>0:
	a=r.pop(0)
	for i in [i for i in range(v)if s[i]==a[2][-1]]:
		b=(a[0]+y[i],a[1]+m[i],a[2]+[t[i]])
		if b[0]<=c:
			if b[2][-1]==n:
				g+=[b]
			else:
				r+=[b]
if len(g)>0:
	a=min(g,key=lambda x:x[1])
	print a[1]
else:
	print -1