import java.util.Scanner;
class Main {
	public static void main(String args[]){
    Scanner scan = new Scanner(System.in);

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

    int max = a + b;

    if(max<a-b) {
    	max=a-b;
    }

    if(max<a*b) {
    	max=a*b;
    }
    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