package algo;

import java.util.*;

public class sample7 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int P1 = sc.nextInt();
		int P2 = sc.nextInt();
		int N = sc.nextInt();
		List<Integer> list = new ArrayList<Integer>();
		
		for(int i=0; i < N; i++) {
			list.add(sc.nextInt());
		}
		
		Set<Integer> set = new HashSet<Integer>(list);
		int AN = list.size() - set.size();
		int c = AN * P1 + AN * P2;
		System.out.println(c);
	}
}