import sys
input = sys.stdin.readline

n, m, k = map(int, input().split())
C = list(map(int, input().split()))
A = list(map(int, input().split()))

B = [k * A[i] for i in range(m)]
ans = 10**18
for i in range(n):
    c = C[i] - 1
    B[c] -= A[c]
    ans = min(ans, min(B))
    if i >= k - 1:
        c = C[i - k + 1] - 1
        B[c] += A[c]
print(ans)