use std::io::stdin;
fn main() {
    let move_list: Vec<i32> = vec![2, 2, -1, -1, 2, -1, -1];

    let mut line: String = String::new();
    stdin().read_line(&mut line).expect("Fail.");
    let x: i32 = line.trim().parse().unwrap();

    let mut count: i32 = 0;
    let mut pos: i32 = 0;
    let mut end_flg: bool = false;
    for _ in 0..100 {
        for n in &move_list {
            pos += n;       
            count += n.abs();

            if pos == x {
                end_flg = true;
                break;
            }
        }

        if end_flg == true {
            break;
        }
    }

    println!("{}", count);
}