Problem:
Score : 100 points

Problem Statement

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.

Sample Input 1

3 1

Sample Output 1

4

3+1=4, 3-1=2 and 3 \times 1=3. The largest among them is 4.

Sample Input 2

4 -2

Sample Output 2

6

The largest is 4 - (-2) = 6.

Sample Input 3

0 0

Sample Output 3

0

Solution in JavaScript (node.js v5.12) (judge verdict: Wrong Answer)

function Main(s){
  s = s.split(" ");
  var num = s[0];
  var mystr = s[1];
  var rslt = [];
  for(var i = 1; i < num; i++){
    var a = mystr.substr(0, i).split('');
    var a_rmv_dup = a.filter((x, i, self) => self.indexOf(x) === i);
    var b = mystr.substr(i, num-1).split('');
    var b_rmv_dup = b.filter((x, i, self) => self.indexOf(x) === i);
    var ab = a_rmv_dup.concat(b_rmv_dup)
    var d = ab.filter(function (x, i, self) {
            return self.indexOf(x) === i && i !== self.lastIndexOf(x);
        });
    rslt.push(d.length);
  }
  console.log(Math.max.apply(null, rslt));
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));