#[allow(dead_code)] #[allow(unused_imports)] fn read() -> T { use std::io::*; let stdin = stdin(); let stdin = stdin.lock(); let token: String = stdin .bytes() .map(|c| c.expect("failed to read char") as char) .skip_while(|c| c.is_whitespace()) .take_while(|c| !c.is_whitespace()) .collect(); token.parse().ok().expect("failed to parse token") } fn main(){ let n:usize = read(); println!("{}",if n % 2 == 1 {1}else if n % 2 == 0 && n != 2{n / 2}else if n == 2{2} else{0}); }