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.*;
 
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
	int a = sc.nextInt();
    int b = sc.nextInt();
    
    int max = a * b;

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

    if(max < a + b){
      max = a+b;
    }
    System.out.println(max);
  }
}