//Numarul de biti dintr-un numar

#include <iostream>
using namespace std;
int N;

int count(int n)
{
    int num = 0;
    if (n)
        do 
		  num++; 
		while (n &= n - 1);
    return num;
}

int main()
{
     cin>>N;
     cout<<count(N)<<'\n';
     return 0;
}