import java.util.Scanner;
import java.lang.Math;

public class Main{
	public static void main(String args[]){
		Scanner scan = new Scanner(System.in);
		final int A = scan.nextInt();
		final int B = scan.nextInt();

		System.out.println(Math.max(A+B,Math.max(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