Problem:
Score : 100 points

Problem Statement

Given is an integer x that is greater than or equal to 0, and less than or equal to 1.
Output 1 if x is equal to 0, or 0 if x is equal to 1.

Constraints

0 \leq x \leq 1

x is an integer

Input

Input is given from Standard Input in the following format:

x

Output

Print 1 if x is equal to 0, or 0 if x is equal to 1.

Sample Input 1

1

Sample Output 1

0

Sample Input 2

0

Sample Output 2

1

Solution in Rust (1.42.0) (judge verdict: Runtime Error)

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| usize::from_str(n).unwrap());
    let (n, m, l, k) = (it.next().unwrap(), it.next().unwrap(),
        it.next().unwrap(), it.next().unwrap());
    let mut v = Vec::new();
    v.push(n * l);
  v.push(n * k);
  v.push(m * l);
  v.push(m * k);
  if let Some(num) = v.iter().max() {
    	println!("{}", num);
  }
}