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 Ruby (2.3.3) (judge verdict: Runtime Error)

n = STDIN.gets.chomp.to_i
s = STDIN.gets.chomp
 
cs = s.chars.uniq
rs = cs.map {|c|
  (s.index(c)..s.rindex(c))
}
 
puts n.times.map {|i|
  rs.select {|r| r.include?(i) }.count
}.max