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.Scanner;
class Main {
    public static void main(String[] args) {

    int A = 0;
    int B = 0;

    Scanner sc = new Scanner(System.in);

    A = sc.nextInt();
    B = sc.nextInt();

    int add = A + B;
    int sub = A - B;
    int C = Math.max(add,sub);

      System.out.println(Math.max(A*B, C));
   }
}