#include <bits/stdc++.h>
using namespace std;

int main() {
  int N, M, K; cin >> N >> M >> K;
  long long Ans = 1e18;
  vector<int> C(N), A(M), Count(M), MaxColor(M);
  for (int &B : C) {
    cin >> B;
    B--;
  }
  for (int &B : A) cin >> B; 

  for (int i = 0; i < K; i++) {
    Count.at(C.at(i))++;
    MaxColor.at(C.at(i)) = max(MaxColor.at(C.at(i)), Count.at(C.at(i)));
  }

  for (int i = K; i < N; i++) {
    Count.at(C.at(i - K))--;
    Count.at(C.at(i))++;
    MaxColor.at(C.at(i)) = max(MaxColor.at(C.at(i)), Count.at(C.at(i)));
  }

  for (int i = 0; i < M; i++)
    Ans = min(Ans, (long long)(K - MaxColor.at(i)) * A.at(i));
  cout << Ans << endl;
}