import java.util.*;
import java.lang.*;
import java.io.*;
 
class Main {
  public static void main (String[] args) {
  	Scanner x = new Scanner(System.in);
	int n = x.nextInt();
	int counter = 0;
	if (n >= 1){
		while (n != 1) {
			counter++;
			if (n % 2 == 0) n = n / 2;
			else n++;
 		}
 		System.out.print(counter);
 	} else System.out.print( "Wrong number" );
  }
}