#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
#define rep(i,s,e) for(int (i) = (s);(i) <= (e);(i)++)

int main(){
  i64 p,q;
  cin >> p >> q;
  int N;
  cin >> N;
  set<int> st;
  i64 ans = 0;
  rep(i,0,N - 1){
    int r;
    cin >> r;
    if(st.count(r)){
      ans += p + q;
    }
    st.insert(r);
  }
  cout << ans << endl;
}