use std::io;

fn main() {
    let mut input = String::new();
    io::stdin()
        .read_line(&mut input)
        .expect("Failed to read line.");
    let x: i32 = input.trim().parse().unwrap();

    let m: [i32; 7] = [2, 2, -1, -1, 2, -1, -1];
    let mut m_max: u32 = 100;
    let mut z: i32 = 0;
    let mut ans: i32 = 0;

    'outer: while m_max > 0 {
        for v in m.iter() {
            z += v;
            ans += v.abs();
            if x == z {break 'outer};
        }
        m_max += 1;
    }

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