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: Wrong Answer)

use std::cmp;

fn main(){
    let mut aa:Vec<i32> = getline().trim().split(' ').map(|e| e.parse().unwrap()).collect();
    
    println!("{}", cmp::max(aa[1] - aa[0], cmp::max(aa[1] + aa[0], aa[1] * aa[0])));
}

fn getline() -> String{
    let mut r = String::new();
    std::io::stdin().read_line(&mut r).ok();
    return r;
}