import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String[] inputAB = scan.nextLine().split(" ");
        Integer a = Integer.valueOf(inputAB[0]);
        Integer b = Integer.valueOf(inputAB[1]);

        List<Integer> results = new ArrayList<Integer>();
        results.add(a + b);
        results.add(a - b);
        results.add(a * b);
        results.sort(Comparator.reverseOrder());

        System.out.println(results.get(0));
        scan.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