/************************************************
Grundlegende Algorithmen mit Java,
http://algorithmen-und-problemloesungen.de/
Copyright @2007-2008 by Doina Logofatu

in C#: Michael Gärtner
************************************************/

using System;
using System.IO;

namespace Logofatu
{
    class P5Ack
    {
        private static String FileInputName = "ack.in";
        private static String FileOutputName = "ack.out";

        private static long ack(long n, long m)
        {
            if ( 0 == n )
                return m + 1;
            else
                if ( 0 == m )
                    return ack(n - 1, 1);
                else
                    return ack(n - 1, ack(n, m - 1));
        }

        static void Main(string[] args)
        {
            StreamReader sr = null;
            StreamWriter sw = null;
            try
            {
                sr = new StreamReader(FileInputName);
                sw = new StreamWriter(FileOutputName);

                while ( !sr.EndOfStream )
                {
                    string[] sArray = sr.ReadLine().Split(' ');
                    long n = long.Parse(sArray[0]);
                    long m = long.Parse(sArray[1]);
                    sw.Write("Ack(");
                    sw.Write(n);
                    sw.Write(", ");
                    sw.Write(m);
                    sw.Write(")= ");
                    sw.WriteLine(ack(n, m));
                }
            }
            catch ( IOException ex )
            {
                Console.WriteLine("Fehler bei der Dateiverarbeitung!\n" + ex);
            }
            finally
            {
                if ( sr != null )
                {
                    sr.Close();
                }
                if ( sw != null )
                {
                    sw.Close();
                }
            }
        }
    }
}