#include <iostream>

using namespace std;

long long n, r;

int main ()

{
    cin>>n;

    if (n==0)
    {
        cout<<0;
    }
    else
    {
        while (n!=0)
        {
            if (n%2==1)
            {
                r++;
            }
            n/=2;
        }
        cout<<r;
    }

    return 0;
}