import java.util.*;
import static java.lang.System.*;

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