You are given two integers A and B. Find the largest value among A+B, A-B and A \times B.

Constraints

* -1000 \leq A,B \leq 1000
* All values in input are integers.

Input

Input is given from Standard Input in the following format:


A B


Output

Print the largest value among A+B, A-B and A \times B.

Examples

Input

3 1


Output

4


Input

4 -2


Output

6


Input

0 0


Output

0
import java.util.Scanner;

public class Main {

	public static void main(String[] args){
		  Scanner sc = new Scanner(System.in);
		  int A = sc.nextInt();
		  int B = sc.nextInt();
		  sc.close();
		  
		  int answer = A + B;
		  answer = Math.max(answer, A - B);
		  answer = Math.max(answer, A * B);
		  
		  System.out.println(answer);
	          System.exit(0);
	    }
}