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 scan = new Scanner(System.in);
  int a = scan.nextInt();
  int b = scan.nextInt();
  int ans = a+b < a-b ? a-b:a+b;
  ans = ans < a*b ? a*b:ans;
  System.out.println(ans);
 }

}
