import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner scan = new Scanner(System.in);
        int A = Integer.parseInt(scan.next()); 
        int B = Integer.parseInt(scan.next()); 
        scan.close();
        int sum = A + B;
        int minus = A - B;
        int multi = A * B;

        if (sum > minus) {
            if (sum > multi) {
                System.out.println(sum);
            } else {
                System.out.println(multi);
            }
        } else {
            if (minus > multi) {
                System.out.println(minus);
            } else {
                System.out.println(multi);
            }
        }
    }
}
/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