

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sn = new Scanner(System.in);

        int a = sn.nextInt();
        int b = sn.nextInt();

        int sum = a + b;
        int sub = a -b;
        int malti = a * b;

        int max = sum;
        if (max < sub) {
            max = sub;
        }
        if (max < malti) {
            max = malti;
        }

        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