#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using ll = long long;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using mint = atcoder::modint998244353;

ll op(ll a,ll b){
	return max(a,b);
}
ll e(){
	return 0;
}
using segtree = atcoder::segtree<ll,op,e>;

int main(){
	ll n,m,k;
	cin>>n>>m>>k;
	vector<ll> c(n),a(m);
	rep(i,n) cin>>c.at(i),c.at(i)--;
	rep(i,m) cin>>a.at(i);
	segtree sg(m);
	ll scs=0;
	rep(i,k){
		scs+=a.at(c.at(i));
		sg.set(c.at(i),sg.get(c.at(i))+a.at(c.at(i)));
	}
	ll ans=scs-sg.all_prod();
	for(int i=k;i<n;i++){
		scs+=a.at(c.at(i))-a.at(c.at(i-k));
		sg.set(c.at(i),sg.get(c.at(i))+a.at(c.at(i)));
		sg.set(c.at(i-k),sg.get(c.at(i-k))-a.at(c.at(i-k)));
		ans=max(ans,scs-sg.all_prod());
	}
	cout<<ans<<endl;
}