#include <iostream>

using namespace std;

int main()
{
    int n,m=0,p=1,x,k=0;
    cin>>n;
    while(n!=0)
    {
        x=n%2;
        m=m+p*x;
        p=p*10;
        n=n/2;
    }
    while(m!=0)
    {
        if(m%10==1) k++;
        m=m/10;
    }
    cout<<k;
    return 0;
}