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::max;

struct MyIo{

}

impl MyIo{
    fn readline()->Vec<String>{
        let mut buf = String::new();
        std::io::stdin().read_line(&mut buf).unwrap();
        let ret:Vec<String> = buf.split_whitespace().map(|c|c.to_string()).collect();
        ret
    }
}


fn main() {

    let mut input = MyIo::readline().into_iter();

    let v1 = input.next().unwrap().parse::<i32>().unwrap();
    let v2 = input.next().unwrap().parse::<i32>().unwrap();

    let result = [v1+v2,v1*v2,v1-v2].iter().fold(0,|a,b| max(a,*b));

    println!("{:?}",result);
}