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

using namespace std;

int main()
{
    int n;
    cin>>n;
    char c[6];
    itoa(n,c,2);
    int k=0;
    for(int j=0;j<strlen(c);j++)if(c[j]=='1')k++;
    cout<<k<<endl;


    return 0;
}