TextToNumber

using System;

class TextToNumber
{
    static void Main()
    {
        int inputNumber = int.Parse(Console.ReadLine());
        string inputText = Console.ReadLine();
        long result = 0;
        foreach (char symbol in inputText)
        {
            if (symbol == '@')
            {
                Console.WriteLine(result);
                return;
            }
            else if (symbol >= '0' && symbol <= '9')
            {
                result *= symbol - '0';
            }
            else if ((symbol >= 'A' && symbol <= 'Z') || (symbol >= 'a' && symbol <= 'z'))
            {
                if (char.IsLower(symbol))
                {
                    result += symbol - 'a';
                }
                else
                {
                    result += symbol - 'A';
                }
            }
            else
            {
                result %= inputNumber;
            }

        }
        Console.WriteLine(result);
    }
}