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 Rust (1.15.1) (judge verdict: Accepted)

use std::io;
use std::str::FromStr;

fn input_int_tuple() -> (i32, i32) {
  let mut line: String = String::new();
  io::stdin().read_line(&mut line);
  let vec: Vec<i32> = line.split_whitespace().map(|s| s.parse().unwrap()).collect();
  (vec[0], vec[1])
}

fn main() {
  let (a, b) = input_int_tuple();
  let mut max = a + b;
  if a - b > max {
    max = a - b;
  }
  if a * b > max {
    max = a * b;
  }
  println!("{}", max);
}