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;//入力を取得する(Scanner)

class Main {
	public static void main(String arts[]) {
		int a,b;
		Scanner sc = new Scanner(System.in);
		a = sc.nextInt();
		b = sc.nextInt();
		int x, y , z;
		x = a + b ;
		y  = a - b;
		z = a * b;

		int ans=y;
	if(x>=y){ 
		ans = x;
	}
	if(ans <= z){
		ans = z ;
	}
	System.out.println(ans);
	}
}
