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 static java.lang.System.*;
public class Main {
  public static void main(String args[]){
    Scanner sc = new Scanner(in);
    int A = sc.nextInt(), B = sc.nextInt();
    int[] array = {A+B,A-B,A*B};
    Arrays.sort(array);
    out.println(array[2]);
  }
}