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

class Solution
{
    static void Main()
    {
        var p1 = int.Parse(Console.ReadLine());
        var p2 = int.Parse(Console.ReadLine());
        var n = int.Parse(Console.ReadLine());
        var pay = p1 + p2;
        var bocking = new HashSet<int>();
        var count = 0;
        for (int i = 0; i < n; i++)
        {
            var room = int.Parse(Console.ReadLine());
            if (bocking.Contains(room))
            {
                count++;
            }
            else
            {
                bocking.Add(room);
            }
        }

        Console.WriteLine(pay * count);
    }
}