#include <iostream>
#include <cmath>
#include <stdlib.h>
#include <cstring>

using namespace std;

int main()
{
    int n,k=0;
    cin>>n;

    int bin=0;
    while(n)
    {
        bin=bin*10+ n%2;
        n/=2;
    }
    while(bin)
    {
        if(bin%10==1)k++;
        bin/=10;
    }
    cout<<k;

    return 0;
}