#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
#include <string.h>
using namespace std;

ifstream f("date.in");
ofstream g("date.out");


int main()
{   int a,nr=0;
    cin >> a;
    while(a)
        {if(a%2==1)
            ++nr;
        a/=2;
        }
    cout << nr << '\n';
    return 0;
}