import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int minus = sc.nextInt() + sc.nextInt();
        int n = sc.nextInt();
        HashSet<Integer> reserve = new HashSet<>();
        int count = 0;
        for (int i = 0; i < n; i++) {
            int x = sc.nextInt();
            if (reserve.contains(x)) {
                count++;
            } else {
                reserve.add(x);
            }
        }
        System.out.println(count * minus);
    }
}