import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int P1 = scan.nextInt();
		int P2 = scan.nextInt();
		int N = scan.nextInt();
		int []R = new int[N];
		for(int i = 0; i < N; i++) {
			R[i] = scan.nextInt();
		}
		scan.close();
		Arrays.sort(R);

		int temp = R[0];
		int cnt = 0;
		for(int i = 1; i < N; i++) {
			if(temp == R[i]) {
				cnt ++;
			}else {
				temp = R[i];
			}
		}
		int ans = (P1 + P2) * cnt;
		System.out.println(ans);
	}
}