#include <math.h>  
#include <iostream>

using namespace std;

int main()
{
	int n;
	cin >> n;
	double x = log(n) / log(2) + 1;
	int cont = 0;
	for (int i = 0; i < x; i++)
	{
		if (1 & (n>>i))
		{
			cont++;
		}
	}
	cout << cont;
	return 0;
}