Encoding Sum_Prb

using System;
using System.Numerics;

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

class Program
{
    static void Main()
    {

        BigInteger n = BigInteger.Parse(Console.ReadLine());
        string input = Console.ReadLine();

        BigInteger sum = 0;


        foreach (var c in input)
        {
            if (c == '@')
            {
                break;
            }


            if  (c == 'A') {sum += 0;}
                else if (c == 'a') {sum += 0;}
                else if (c == 'B') {sum += 1;}
                else if (c == 'b') {sum += 1;}
                else if (c == 'C') {sum += 2;}
                else if (c == 'c') {sum += 2;}
                else if (c == 'D') {sum += 3;}
                else if (c == 'd') {sum += 3;}
                else if (c == 'E') {sum += 4;}
                else if (c == 'e') {sum += 4;}
                else if (c == 'F') {sum += 5;}
                else if (c == 'f') {sum += 5;}
                else if (c == 'G') {sum += 6;}
                else if (c == 'g') {sum += 6;}
                else if (c == 'H') {sum += 7;}
                else if (c == 'h') {sum += 7;}
                else if (c == 'I') {sum += 8;}
                else if (c == 'i') {sum += 8;}
                else if (c == 'J') {sum += 9;}
                else if (c == 'j') {sum += 9;}
                else if (c== 'K' ) { sum += 10;}
                else if (c== 'k' ) { sum += 10;}
                else if (c== 'L' ) { sum += 10;}
                else if (c== 'l' ) { sum += 11;}
                else if (c== 'M' ) { sum += 12;}
                else if (c== 'm' ) { sum += 12;}
                else if (c== 'N' ) { sum += 13;}
                else if (c== 'n' ) { sum += 13;}
                else if (c== 'O' ) { sum += 14;}
                else if (c== 'o' ) { sum += 14;}
                else if (c== 'P' ) { sum += 15;}
                else if (c== 'p' ) { sum += 15;}
                else if (c== 'Q' ) { sum += 16;}
                else if (c== 'q' ) { sum += 16;}
                else if (c== 'R' ) { sum += 17;}
                else if (c== 'r' ) { sum += 17;}
                else if (c== 'S' ) { sum += 18;}
                else if (c== 's' ) { sum += 18;}
                else if (c== 'T' ) { sum += 19;}
                else if (c== 't')  { sum += 19;}
                else if (c== 'U')  { sum += 20;}
                else if (c== 'u')  { sum += 20;}
                else if (c== 'V')  { sum += 21;}
                else if (c== 'v')  { sum += 21;}
                else if (c== 'W')  { sum += 22;}
                else if (c== 'w')  { sum += 22;}
                else if (c== 'X')  { sum += 23;}
                else if (c== 'x')  { sum += 23;}
                else if (c== 'Y')  { sum += 24;}
                else if (c== 'y')  { sum += 24;}
                else if (c== 'Z')  { sum += 25;}
                else if (c== 'z')  { sum += 25;}
                else if (c== '0')  { sum *= 0; }
                else if (c== '1')  { sum *= 1; }
                else if (c== '2')  { sum *= 2; }
                else if (c== '3')  { sum *= 3; }
                else if (c== '4')  { sum *= 4; }
                else if (c== '5')  { sum *= 5; }
                else if (c== '6')  { sum *= 6; }
                else if (c== '7')  { sum *= 7; }
                else if (c== '8')  { sum *= 8; }
                else if (c== '9')  { sum *= 9; }

                //else if (c== ' ')  { sum = sum % n;}
                //else if (c== '.')  { sum = sum % n;}
                //else if (c== ',')  { sum = sum % n;
                //else if (c== '-')  { sum = sum % n;}
                //else if (c== '(')  { sum = sum % n;}
                //else if (c== ')')  { sum = sum % n;}
                //else if (c== ':')  { sum = sum % n;}
                //else if (c== ';')  { sum = sum % n;}

                else { sum = sum % n; }

        }
        //string t = Convert.ToString(sum);
        //BigInteger answer = BigInteger.Parse(t);

        Console.Write("{0}", sum);

    }
}