N,C,V = int(input()),int(input()),int(input())
S = [int(i) - 1 for i in input().split()]
T = [int(i) - 1 for i in input().split()]
Y = [int(i) for i in input().split()]
M = [int(i) for i in input().split()]
INF = 10 ** 9 + 7
dp = [[INF for j in range(C + 1)] for i in range(N)]
dp[0][0] = 0
for i in range(N):
	for j in range(C):
		for k in range(V):
			if S[k] == i and j + Y[k] <= C:
				dp[T[k]][j + Y[k]] = min(dp[T[k]][j + Y[k]],dp[i][j] + M[k])
ans = INF
for i in range(C + 1):
	ans = min(ans,dp[N - 1][i])
print(-1 if ans == INF else ans)