/*No.586 ダブルブッキング*/
import java.io.*;
import java.util.*; 
public class No586 {
	public static void main(String[] args) {
		try(BufferedReader input =new BufferedReader(new InputStreamReader(System.in))){
			int YukiPrice=Integer.parseInt(input.readLine());
			int OtherPrice=Integer.parseInt(input.readLine());
			byte Reservation=Byte.parseByte(input.readLine());
			short[] RoomNum=new short[Reservation];
			short ChkRoom;
			byte booking=0;
			for(byte i=0;i<RoomNum.length;i++){
				RoomNum[i]=Short.parseShort(input.readLine());
			}
			Arrays.sort(RoomNum);
		for(byte j=0;j<RoomNum.length-1;j++){
				ChkRoom=RoomNum[j];
				while(j<RoomNum.length-1&& ChkRoom==RoomNum[j+1]){
					booking++;
					j++;
				}
			}
			System.out.println(YukiPrice*booking+OtherPrice*booking);
		}catch(Exception e){
			e.printStackTrace();
		}
	}
}