using System;
using System.Collections.Generic;
using System.Linq;

namespace Game
{
    class Program
    {
        static void Main(string[] args)
        {

            string n = Console.ReadLine();

            List<int> number = n.ToString()
                .Select(x => Convert.ToInt32(x.ToString()))
                .ToList();

            int case1 = (number[0] * number[1]) + number[2];

            int case2 = (number[1] * number[2]) + number[0];

            int case3 = (number[0] * number[2]) + number[1];

            int case4 = number.Sum();

            int case5 = number[0] * number[1] * number[2];

            List<int> values = new List<int>();

            values.Add(case1);
            values.Add(case2);
            values.Add(case3);
            values.Add(case4);
            values.Add(case5);

            int result = values.Max(x => x);

            Console.WriteLine(result);

        }
    }
}