#include <iostream>
#include <fstream>

using namespace std;

int main() {
	int x;
	
	cin>>x;
	
	int aux;

    if (x == 0) {
        cout<<0;
        return 0;
    }
    if (x ==1) {
        cout<<1;
        return 0;
    }

    int counter = 0;
    while (x > 0) {
        if (x%2) {
            counter++;
        }
        x /= 2;

    }

	cout<<counter;
	
	
	
	return 0;
}