import java.util.*;

public class Main{
	public static void main(String args[]){
        Scanner sc1 = new Scanner(System.in);
        int a = sc1.nextInt();
        int b = sc1.nextInt();
        int max = a+b;
        if(max < a-b){
            max = a-b;
        }
        if(max < a*b){
            max = a*b;
        }
        System.out.print(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