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.*; 
import java.math.*;
class Main{
public static void main(String[] args){
  Scanner sc=new Scanner(System.in);
  
  int a=sc.nextInt();
  int b=sc.nextInt();
  //int c=sc.nextInt();
  int sum=a+b;
  int sub=a-b;
  int mul=a*b;
  int ans = Math.max(sum,sub);
  System.out.println(Math.max(ans,mul));
  //System.out.println(ans);
  
}
}
