class Program
{
    static void Main(string[] args)
    {
        int myPrice = int.Parse(Console.ReadLine()!);
        int price = int.Parse(Console.ReadLine()!);
        int count = int.Parse(Console.ReadLine()!);
        List<int> numList = new List<int>();

        for (int i = 0; i < count; i++)
        {
            int roomNum = int.Parse(Console.ReadLine()!);
            numList.Add(roomNum);
        }
        numList.Sort();

        int duplication = 0;
        for (int i = 0; i < numList.Count - 1;i++)
        {
            if (numList[i] == numList[i + 1])
            {
                duplication++;
            }
        }

        int ans = duplication * (myPrice + price);
        Console.WriteLine(ans);
    }
}