using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    public void Solve()
    {
        int P1 = int.Parse(Console.ReadLine());
        int P2 = int.Parse(Console.ReadLine());
        int N = int.Parse(Console.ReadLine());
        List<int> R = new List<int>();
        for (int i = 0; i < N; i++)
        {
            R.Add(int.Parse(Console.ReadLine()));
        }

        int sonshitsu = 0;
        foreach (var item in R.Distinct())
        {
            var count = R.Where(x => x == item).Count();
            sonshitsu += (R.Where(x => x == item).Count() - 1) * (P1 + P2);
        }
        Console.WriteLine(sonshitsu);
    }

    static void Main()
    {
        var solver = new Program();
        solver.Solve();
    }
}