#include <iostream>
using namespace std;

unsigned int bitCount(unsigned int value) {
	unsigned int count = 0;
	while (value > 0)
	{          
		if ((value & 1) == 1)    
			count++;
		value >>= 1;             
	}
	return count;
}

int main()
{
	int p;
	cin >> p;
	cout << bitCount(p);
	//cin.get();
}