import java.util.*;
public class Main{
	public static void main(String args []){
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt(), b = sc.nextInt(), max = 0;
		if(a+b > a-b){
			max = a+b;
		}else{
			max = a-b;
		}
		if(max > a*b){
			max = max;
		}else{
			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