using System;

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = int.Parse(Console.ReadLine());
            int b = int.Parse(Console.ReadLine());
            int c = int.Parse(Console.ReadLine());
            string[] s1 = new string[c];
            int count = 0;
            int ans = a + b;
            string d = "";
            for (int i = 0; i < c; i++)
            {
                string s = Console.ReadLine();
                s1[i] = s;
            }
            Array.Sort(s1);
            for(int j = 0; j < c-1; j++)
            {
                if (s1[j] == s1[j+1])
                {
                    count++;
                    
                }
            }
            if (count >= 1)
            {
                ans *= count;
            }
            else
            {
                ans = 0;
            }
            Console.WriteLine(ans);
        }
    }
}