import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int n = sc.nextInt();
		int[] r = new int[n];
		for(int i = 0 ; i < n ; i++) r[i] = sc.nextInt();
		int sum = 0;
		for(int i = 0 ; i < n ; i++) {
			for(int j = i + 1 ; j < n ; j++) {
				if(r[i] == r[j]) {
					sum += a + b;
					break;
				}
			}
		}
		System.out.println(sum);
	}
}