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) {
    try(Scanner sc = new Scanner(System.in)) {
      int A = sc.nextInt();
      int B = sc.nextInt();
      int c1 = A + (int)Math.abs(B);
      int c2 = A * B;
      int c = c1 < c2 ? c2 : c1;
      System.out.println(c);
    }
  }
}