import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int A = sc.nextInt();
        int B = sc.nextInt();
    
        List<Integer> resultList = new ArrayList<>();
        resultList.addAll(Arrays.asList(A+B, A-B, A*B));
        
        int max = -100;
        for (int i=0; i<resultList.size(); i++) {
            max = Math.max(max, resultList.get(i));
        }
        System.out.println(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