import java.util.*;

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