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);
     final int A=sc.nextInt();
     final int B=sc.nextInt();
     int[] x={A+B,A-B,A*B};
     Arrays.sort(x);
     System.out.println(x[2]);
   }
}