using System;

public class Program

{

    public static void Main()

    {

        int n,a,count=0,j,b=0;

        Console.WriteLine("enter the number below 1024");

        n=Convert.ToInt32(Console.ReadLine());

        a=n;

        while(a>0)

        {

            a=a/2;

            b++;

        }

        int []x=new int[b];

        for(j=0;j<=b-1;j++)

        {

            x[j]=n%2;

            n=n/2;

            if(x[j]==1)

            {

                count++;

            }

        }

        Console.WriteLine("no of 1s in the number={0}",count);  

    }

}