N=int(input())
C=int(input())
V=int(input())
L=[[]for i in range(N+1)]
S=list(map(int,input().split()))
T=list(map(int,input().split()))
Y=list(map(int,input().split()))
M=list(map(int,input().split()))

for i in range(V):
    L[S[i]].append([T[i],Y[i],M[i]])
    
dp=[[10**4 for i in range(C+1)]for j in range(N+1)]
dp[1][0]=0

for i in range(1,N+1):
    for j in range(C+1):
        for k in range(len(L[i])):
            if j+L[i][k][1]<=C:
                dp[L[i][k][0]][j+L[i][k][1]]=min(dp[L[i][k][0]][j+L[i][k][1]],dp[i][j]+L[i][k][2])
if min(dp[-1])>=10**4:
    print(-1)
else:
    print(min(dp[-1]))