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;

public class Main {
    public static void main(String args[]){
        Scanner scan = new Scanner(System.in);
        int A = scan.nextInt();
		int B = scan.nextInt();
		scan.close();
        int lg = A+B;
        lg = A-B>lg? A-B : lg;
        lg = A*B>lg? A*B : lg;
        System.out.println(lg); 
    }
}