
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.math.*;
public class Main {

    public static void main(String[] args) throws Exception {

        InputStreamReader is = new InputStreamReader(System.in);
        BufferedReader reader = new BufferedReader(is);

        String s = reader.readLine();
        
        String arr[]=s.split(" ");
        
        int a = Integer.valueOf(arr[0]);
        int b = Integer.valueOf(arr[1]);
        
        System.out.println(Math.max(Math.max(a+b,a-b),a*b));
        
        
    }

}




/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