using System;

namespace JudjeTestssss
{
    class Program
    {
        static void Main(string[] args)
        {
            int num = int.Parse(Console.ReadLine());


            int a = num % 10;
            int b = num / 10 % 10;
            int c = num / 100;

            var result1 = a * b * c;
            var result2 = a + b + c;
            var result3 = a * b + c;
            var result4 = a + b * c;

            Console.WriteLine(Math.Max(Math.Max(result1,result2),Math.Max(result3,result4)));



        }
    }
}