import java.util.*;
import java.lang.*;
import java.io.*;
 public class Main{
   public static void main(String[]args){
     Scanner s = new Scanner(System.in);
     int a = s.nextInt();
     int b = s.nextInt();
     int c = a+b;
     int d = a-b;
     int e =a*b;
     System.out.println(Math.max(c,Math.max(d,e)));
   }
 }
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz