import java.util.ArrayList;
import java.util.Scanner;


public class No586 {

    public static void main(String[] args) {
	Scanner s = new Scanner(System.in);
	int P1 = s.nextInt();
	int P2 = s.nextInt();
	int N = s.nextInt();
	int C = 0;
	ArrayList<Integer> room = new ArrayList<>();

	for(int i=0;i<N;i++){
	    int R = s.nextInt();
	    if(!room.contains(R)){
		room.add(R);
	    }else{
		C += P1 + P2;
	    }
	}
	System.out.println(C);
    }

}