import java.util.*;
public class Biscuits{
	public static void main(String... args){
		Scanner scan = new Scanner(System.in);
		double n = scan.nextInt();
		System.out.println(clap(n));
	}
	public static int clap(double n){
		int count = 0;
		while(n > 1){
			n = Math.ceil(n/2);
			count++;
		}
		return count;
	}
}