using System;

​

public class Program

{

    public static void Main()

    {

        string str = "";

        int n = int.Parse(Console.ReadLine());

        long number = 0;

​

        for (int i = 0; i < n; i++)

        {

            str += Console.ReadLine();

        }

        for (int i = 0; i < str.Length; i++)

        {

            number *= 26;

            number += (str[i] - 'A' + 1);

        }

        Console.WriteLine(number);

    }

}