#include <stdio.h>

void main(void) {
	int hotelA = 0 ,hotelB = 0;
	scanf("%d\n%d\n",&hotelA,&hotelB);
	int reservation = 0;
	scanf("%d ",&reservation);
	int roomNumber[reservation];
	for(int i = 0 ; i < reservation;i++){
		scanf("%d\n",&reservation);
	}
	int loss = 0;
	for(int i = 0 ; i < reservation;i++){
		if(roomNumber[i] == 0){
			continue;
		}
		for(int j = i ; j < reservation ; j++){
			if(roomNumber[i] == roomNumber[j]){
				roomNumber[j] = 0;
				loss += hotelA+hotelB;
			}
		}
	}
	printf("%d",loss);
}