import java.util.*;
public class Biscuit{
	public static void main(String[] arg){
		int n,res=0;
		Scanner sc = new Scanner(System.in);
		n = sc.nextInt();
		while(n != 1){
			if(n%2 ==1){
				n = (n+1) /2;
			}else{
				n = n/2;
			}
			res++;
		}
		System.out.println(res);
	}
}