fn main() {
	let mut n = String::new();
	std::io::stdin().read_line(&mut n).ok();
	let mut n: i32 = n.trim().parse().unwrap();
	let mut ans: i32 = 0;
	while 1 < n {
		if n % 2 == 1 {
			n += 1;
			ans += 1;
		} else {
			n >>= 1;
			ans += 1;
		}
	}
	println!("{}", ans);
}