#include<iostream>
#include<math.h>
using namespace std;
int main()
{
    int n,c=0,s=0,u=0,aux=0;
    cin>>n;
    while(n)
    {
        if(n%2==1)s=s+pow(10,c);
        c++;
        n=n/2;
    }
    while(s)
    {
        u=s%10;
        s=s/10;
        if(u==1)
            aux++;
    }
    cout<<aux;
}