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.*;

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

		Scanner sc = new Scanner(System.in);
		
		int N = sc.nextInt();
		int M = sc.nextInt();

		if(N*M >= N+M){
			if(N*M > N-M) System.out.println(N*M);
			else System.out.println(N-M);
		}
		else{
			if(N+M > N-M) System.out.println(N+M);
			else System.out.println(N-M);
		}
	}
}