import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int sum1 = a + b;
        int sum2 = a - b;
        int sum3 = a * b;
        
        if(sum1 >= sum2 && sum1 >= sum3){
            System.out.print(sum1);            
        }
        else if(sum2 >= sum1 && sum2 >= sum3){
            System.out.print(sum2);
        }
        else if(sum3 >= sum1 && sum3 >= sum2){
            System.out.print(sum3);
        }
        
    }
}
/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