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){
      	//データ取り込み
		Scanner sc = new Scanner(System.in);

		int N = sc.nextInt();
      	int M = sc.nextInt();
      	int a[] = new int[3];
      	a[0] = N + M;
      	a[1] = N - M;
      	a[2] = N * M;
      	Arrays.sort(a);
		System.out.println(a[2]);      
    }
}