#include <iostream>
#include <vector>
using namespace std;
 
int main(){
    int P1, P2, N;
    cin >> P1 >> P2 >> N;
    vector<int> bookings;
    for(int i = 0; i < N; i++){
        int booking;
        cin >> booking;
        bool if_ok = true;
        for(int j = 0; j < bookings.size(); j++){
            if(bookings[j] == booking){
                if_ok = false;
                break;
            }
        }
        if(if_ok){
            bookings.push_back(booking);
        }
    }
    cout << (N - bookings.size()) * (P1 + P2) << endl;
}