use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let mut n: usize = itr.next().unwrap().parse().unwrap();

    let mut ans = 0;
    while n != 1 {
        if n & 1 == 1 {
            n += 1;
            ans += 1;
        }
        ans += 1;
        n >>= 1;
    }
    println!("{}", ans);
}