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