import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
       Scanner scan = new Scanner(System.in);
       int A = scan.nextInt();
       int B = scan.nextInt();
       int add = A + B ;
       int sub = A - B ;
       int mul = A * B ;
       int max;
       if (add <= sub){
            max = Math.max(sub, mul);
        } else {
            max = Math.max(add, mul);
        }
       System.out.println(max);
       
    }
    
}

/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