#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <math.h>
int main(void)
{
    int yukip,transferp,numofreservations,lossamount=0,bookingcnt=0;
    int roomnumber[1000]={0};
    scanf("%d",&yukip);
    scanf("%d",&transferp);
    scanf("%d",&numofreservations);
    for(int i=0;i<numofreservations;i++)
    {
        scanf("%d",&roomnumber[i]);
    }
    for(int i=0;i<numofreservations;i++)
    {
        for(int j=i+1;j<numofreservations;j++)
        {
            if(roomnumber[i]==roomnumber[j])
            {
                bookingcnt++;
                break;
            }
        }
    }
    lossamount=bookingcnt*(yukip+transferp);
    printf("%d",lossamount);
}