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);

		int a=sc.nextInt();
		int b=sc.nextInt();
		int x[]={a+b,a-b,a*b};

		int max=-10000;
		for(int i=0;i<3;i++){
			if(max<x[i]){
				max=x[i];
			}
		}
		System.out.println(max);

	}
}
