import java.util.*;
import java.lang.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int r1 = a + b;
        int r2 = a - b;
        int r3 = a * b;
        if(r1<r2){
            if(r2<r3){
                System.out.println(r3);
            }else{
                System.out.println(r2);
            }
        }else{
            if(r1<r3){
                System.out.println(r3);
            }else{
                System.out.println(r1);
            }
        }
        sc.close();
    }
}
/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