#[macro_export]
macro_rules! setup {
    { mut $input:ident: SplitWhitespace $(,)? } => {
        use std::io::Read;
        let mut buf = String::new();
        std::io::stdin().read_to_string(&mut buf).ok();
        let mut $input = buf.split_whitespace();
    };
}

#[macro_export]
macro_rules! parse_next {
    ($str_iter:expr) => {
        $str_iter.next().unwrap().parse().ok().unwrap()
    };
}

fn main() {
    setup! { mut input: SplitWhitespace };

    let n: usize = parse_next!(input);

    let ans = (|| {
        let mut n = n;
        let mut count = 0;
        loop {
            if n == 1 {
                break;
            }
            match n % 2 {
                0 => n /= 2,
                1 => n += 1,
                _ => unreachable!(),
            }
            count += 1;
        }
        count
    })();

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