#include <iostream>
#include <limits.h>
#include <cmath>
#include <stdio.h>
#include <algorithm>
#include <stdlib.h>
#include <vector>
#include <stack>
#include <map>
#include <cstdlib>

using namespace std;

string s;
int i,n,bits=0;

int main()
{
    cin>>n;

    while(n != 0)
    {
        if (n % 2 == 0) n=n/2;
            else
                bits++,n=n/2;
    }

    cout<<bits;

    return 0;
}