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 Common Lisp (SBCL 1.1.14) (judge verdict: Accepted)

(defun AddSubMul (a b)
  (let ((n (+ a b)) (m (- a b)) (l (* a b)))
    (max n m l)))

(defun split-string (str)
  (let ((string-position (position #\Space str)))
    (cond
      ((null string-position) (list str))
      (t (cons (subseq str 0 string-position) (split-string (subseq str (1+ string-position))))))))

(format t "~A~%" 
  (apply #'AddSubMul (mapcar #'parse-integer (split-string (read-line)))))