Encoding sum

using System;
class Program
{
    static void Main()
    {
        int m = Int32.Parse(Console.ReadLine());
        string input = Console.ReadLine().ToLower();
        long result = 0;
        for (int i = 0; i < input.Length; i++)
        {
            if (input[i] == '@')
            {
                Console.WriteLine(result); return;
            }
            else if (input[i] >= '0' && input[i] <= '9') result *= input[i] - '0';
            else if (input[i] >= 'a' && input[i] <= 'z') result += input[i] - 'a';
            else result %= m;
        }
    }
}