#include<bits/stdc++.h>
#if __has_include(<atcoder/all>)
#endif
using namespace std;
#define LL(...) ll __VA_ARGS__;lin(__VA_ARGS__)
#define RDVL(T,n,...) vec<T>__VA_ARGS__;fe(refs(__VA_ARGS__),e)e.get().resizes(n);lin(__VA_ARGS__)
#define RDVV(T,n,...) vec<T>__VA_ARGS__;fe(refs(__VA_ARGS__),e)e.get().resizes(n);vin(__VA_ARGS__)
#define VL(n,...) RDVL(ll,n,__VA_ARGS__)
#define VV(n,...) RDVV(ll,n,__VA_ARGS__)
#define fo(i,...) for(auto[i,i##stop,i##step]=for_range<ll>(0,__VA_ARGS__);i<i##stop;i+=i##step)
#define fe(a,e,...) for(auto&&__VA_OPT__([)e __VA_OPT__(,__VA_ARGS__]):a)
#define comp_iota(a,op) [&](auto i,auto j){return a[i] op a[j];}
#define defpp template<ostream&o=cout>void pp(const auto&...a){[[maybe_unused]]const char*c="";((o<<c<<a,c=" "),...);o<<'\n';}void epp(const auto&...a){pp<cerr>(a...);}
#define entry defpp void main();void main2();}int main(){my::io();my::main();}namespace my{
namespace my{
void io(){cin.tie(nullptr)->sync_with_stdio(0);cout<<fixed<<setprecision(15);}
using ll=long long;
constexpr auto refs(auto&...a){return array{ref(a)...};}
template<class T>constexpr auto for_range(T s,T b){T a=0;if(s)swap(a,b);return array{a-s,b,1-s*2};}
void lin(auto&...a){(cin>>...>>a);}
void vin(auto&...a){fo(i,(a.size()&...))(cin>>...>>a[i]);}
template<class...A>using pack_back_t=tuple_element_t<sizeof...(A)-1,tuple<A...>>;
auto pack_first(const auto&...a){return get<0>(tuple{a...});}
auto pack_back(const auto&...a){return get<sizeof...(a)-1>(tuple{a...});}
}
namespace my{
template<class V>concept vectorial=is_base_of_v<vector<typename remove_cvref_t<V>::value_type>,remove_cvref_t<V>>;
template<class V>istream&operator>>(istream&i,vector<V>&v){fe(v,e)i>>e;return i;}
template<class V>constexpr int depth=0;
template<class T>struct core_t_helper{using type=T;};
template<class T>using core_t=core_t_helper<T>::type;
template<class V>struct vec;
template<int D,class T>struct hvec_helper{using type=vec<typename hvec_helper<D-1,T>::type>;};
template<class T>struct hvec_helper<0,T>{using type=T;};
template<int D,class T>using hvec=hvec_helper<D,T>::type;
template<class V>struct vec:vector<V>{
  static constexpr int D=depth<V>+1;
  using C=core_t<V>;
  using vector<V>::vector;
  void resizes(const auto&...a){if constexpr(sizeof...(a)==D)*this=make(a...,C{});else{ }}
  static auto make(ll n,const auto&...a){
    if constexpr(sizeof...(a)==1)return vec<C>(n,array{a...}[0]);
    else { }
  }
  vec&operator--(){fe(*this,e)--e;return*this;}
  ll size()const{return vector<V>::size();}
  vec zeta()const{vec v=*this;if constexpr(vectorial<V>){ }fo(i,v.size()-1)v[i+1]+=v[i];return v;}
  template<class F=less<>>auto sort(F f={})const{vec v=*this;ranges::sort(v,f);return v;}
  vec reorder_from(vec<int>&o)const{vec res(size());fo(i,size())res[i]=(*this)[o[i]];return res;}
  auto segment_sum(ll a,ll b)const{assert(0<=a&&a<=b&&b<=size());
    C res=0;
    if(b)res+=(*this)[b-1];
    if(a)res-=(*this)[a-1];
    return res;
  }
};
template<class...A>requires(sizeof...(A)>=2)vec(const A&...a)->vec<hvec<sizeof...(A)-2,pack_back_t<A...>>>;
template<class T=int>auto iota(ll l,ll r=0){if(l>r)swap(l,r);vec<T>v(r-l);std::iota(v.begin(),v.end(),l);return v;}
template<class T=int>auto iota_sort(ll n,const auto&f){return iota<T>(n).sort(f);}
auto sorts(auto&&...a){auto o=iota_sort(pack_first(a...).size(),pack_back(a...));([&o](auto&e){if constexpr(vectorial<decltype(e)>)e=e.reorder_from(o);}(a),...);return o;}
}
namespace my{entry
void main(){
  LL(N,M,X);
  VV(N,a,b);--b;
  LL(K);
  VL(K,c);

  sorts(a,b,comp_iota(a,>));
  // ジャンルが増えるとき,各ジャンル最もスコアが高いものが最初に選ばれるのが
  // 最適で,その問題のスコアにXを加えて仕舞えば,ジャンルの種類数を考慮する必要がなくなり,
  // ただスコアの降順に問題を並べればいいだけになる.
  vec<bool>used(M);
  fo(i,N){
    if(used[b[i]])continue;
    used[b[i]]=1;
    a[i]+=X;
  }

  sorts(a,b,comp_iota(a,>));
  auto s=a.zeta();

  ll ans=0;
  fo(i,K)ans+=s.segment_sum(0,c[i]);
  pp(ans);
}}