import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		scan.close();
		int cnt = 0;
		while(1 < N) {
			if(N % 2 == 1) {
				N++;
				cnt++;
			}else {
				N /= 2;
				cnt++;
			}
		}
		System.out.println(cnt);
	}
}