import java.io.*;
import java.util.*;


public class Main_yukicoder586 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		int p1 = sc.nextInt();
		int p2 = sc.nextInt();
		int n = sc.nextInt();

		int[] r = new int[n];
		int[] rr = new int[999];
		for (int i = 0; i < n; i++) {
			r[i] = sc.nextInt();

			rr[r[i] - 1]++;
		}

		long ans = 0;
		for (int i = 0; i < 999; i++) {
			if (rr[i] > 1) {
				ans += (long)(p1 + p2) * (rr[i] - 1);
			}
		}

		pr.println(ans);
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);

		solve();

		pr.close();
		sc.close();
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}