import java.util.*;

class Main {
 public static void main(String[] args) {
   Scanner sc = new Scanner(System.in);
   int A = sc.nextInt();
   int B = sc.nextInt();
   
   int sum = A + B;
   int sub = A - B;
   int mul = A * B;
   
   if(mul > sum) {
    if(mul > sub) {
     System. out.println(mul);
    }else {
     System. out.println(sub);
    }
   }else {
    if(sum > sub){
      System. out.println(sum);
    }else {
      System. out.println(sub); 
    }
   }
 }
}
/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