INF=float('inf')
n=int(input())
c=int(input())
v=int(input())

from collections import defaultdict
edge=defaultdict(list)

s=list(map(lambda x:int(x)-1,input().split()))
t=list(map(lambda x:int(x)-1,input().split()))
y=list(map(int,input().split()))
m=list(map(int,input().split()))
for i in range(v):
    si,ti,yi,mi=s[i],t[i],y[i],m[i]
    edge[si].append((ti,yi,mi))

dp=[[] for i in range(n)]
dp[0]=[(0,0)]
for ci in range(n):
    for cy,cm in dp[ci]:
        for ni,ny,nm in edge[ci]:
            if cy+ny<=c:
                dp[ni].append((cy+ny,cm+nm))

if dp[-1]:
    print(min([mm for yy,mm in dp[-1]]))
else:
    print(-1)