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 main() {
    let stdin = io::stdin();
    let mut buf = String::new();
    stdin.read_line(&mut buf).ok();
    let mut it = buf.split_whitespace().map(|n| isize::from_str(n).unwrap());
    let (n, m) = (it.next().unwrap(), it.next().unwrap());
		
		if n+m > n*m{
			if n+m > n-m{
				println!("{}",n+m);
			}
			else{
				println!("{}",n-m)
			}
		}
		else{
			if n*m > n-m{
				println!("{}",n*m);
			}
			else{
				println!("{}",n-m);
			}
		}
}