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

namespace ABC138A
{
    class Program
    {
        static void Main(string[] args)
        {
            int a, b, max;
            var word = Console.ReadLine().Split(' ');
            a = int.Parse(word[0]);
            b = int.Parse(word[1]);
            max = a + b;
            if (max < a - b) max = a - b;
            if (max < a * b) max = a * b;
            Console.WriteLine(max);
            Console.ReadKey();
        }
    }
}
