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

template<class T> istream& operator >> (istream& is, vector<T>& vec) {
    for(T& x : vec) is >> x;
    return is;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, m, k;
    cin >> n >> m >> k;
    vector<vector<int>> tb(m);
    vector<ll> a(m);
    for(int i = 0, v; i < n; i++){
        cin >> v;
        tb[--v].emplace_back(i);
    }
    cin >> a;
    ll ans = 1ll << 61;
    for(int i = 0; i < m; i++){
        for(int l = 0, r = 0; l < tb[i].size(); l++){
            while(r < tb[i].size() && tb[i][r] < tb[i][l] + m) r++;
            ans = min(ans, a[i] * (m - r + l));
        }
    }
    cout << ans << '\n';
}