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

public class Main {
    public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
    	int p1 = sc.nextInt();
    	int p2 = sc.nextInt();
    	int n = sc.nextInt();
    	ArrayList<Integer> li = new ArrayList<Integer>();
    	
    	for(int i = 0 ; i < n ; i++) {
    		int r = sc.nextInt();
    		li.add(r);
    	}
    	
    	HashSet<Integer> hs = new HashSet<Integer>(li);
    	int a = n - hs.size();
    	System.out.println(a * p1 + a * p2);
    }
}