/* package whatever; // don't place package name! */
 
import java.util.Scanner;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int n, m;
		double k;
		Scanner scan = new Scanner(System.in);
    	n = scan.nextInt();
    	m = (int)(Math.log(n)/Math.log(2));
		k = (double)(Math.log(n)/Math.log(2));
    	while (m != k){
        	n = (int)(n - (Math.pow(2,m)));
        	m = (int)(Math.log(n)/Math.log(2));
        	k = (double)(Math.log(n)/Math.log(2));
    	}
    System.out.print(m + 1);
	}
}