class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            string[] str = new string[n];
            str[0] = Console.ReadLine();
            List<string> candidate = new List<string>();
            for (int i = 1; i < n; i++)
            {
                str[i] = Console.ReadLine();
                candidate = CandidateString(candidate, str, i);
            }
            Console.WriteLine(candidate.Count);
            
        }

        private static List<string> CandidateString(List<string> candidate, string[] str, int i)
        {
            for(int j = 0; j < i; j++)
            {
                if (!candidate.Contains(str[i] + str[j]))
                {
                    candidate.Add(str[i] + str[j]);
                }
                if (!candidate.Contains(str[j] + str[i]))
                {
                    candidate.Add(str[j] + str[i]);
                }
            }
            return candidate;
        }
    }