TextToNumber-Redacted

using System;

class Printing
{
    static void Main()
    {
        int M = int.Parse(Console.ReadLine());

        String str = Console.ReadLine();

        long result = 0;

        foreach (var ch in str)
        {
            if (ch == '@')
            {
                break;
            }
            else if (ch >= 'a' && ch <= 'z')
            {
                result = result + (ch - 'a');
            }
            else if (ch >= 'A' && ch <= 'Z')
            {
                result = result + (ch - 'A');
            }
            else if (ch >= '0' && ch <= '9')
            {
                result = result * (ch - '0');
            }

            else
            {
                result = result % M;
            }
        }
        Console.WriteLine(result);
    }
}