N,M,K = map(int,input().split())
C = list(map(int,input().split()))
A = [0]+list(map(int,input().split()))
B = {j:0 for j in range(1,M+1)}
for i in range(K):
    B[C[i]] += 1
ans = 10**15
for j in range(1,M+1):
    ans = min(ans,A[j]*(K-B[j]))
for i in range(1,N-K+1):
    B[C[i-1]] -= 1
    B[C[i+K-1]] += 1
    ans = min(ans,A[C[i+K-1]]*(K-B[C[i+K-1]]))
print(ans)