using System;

public class No47 {
	public static void Main() {
	    
	    int bis = int.Parse(Console.ReadLine());
	    int count = 0;
	    int temp = 0;
	    int now = 1;
	    
	    while( now != bis ){ 
	        temp = 1;
	        while( (temp * 2) + now < bis ){
	            temp*= 2;
	            count++;
	        }
	        now+= temp;
        }
        Console.WriteLine(count);
	}
}