import java.util.Arrays;
import java.util.LinkedList;
import java.util.Scanner;

public class Main {
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		final long N = sc.nextLong();
		
		int count = 0;
		long x = N;
		while(x != 1){
			if(x % 2 == 0){
				x /= 2; count++;
			}else{
				x++; count++;
			}
		}
		
		System.out.println(count);
	}
}