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
// A - Add Sub Mul
#include <bits/stdc++.h>
using namespace std;

int main(){
	int a,b; cin>>a>>b;
	cout<< max({a+b, a-b, a*b}) <<endl;
}