#include <iostream>

int main() {
	int x;
	int bitcount = 0;
	std::cin >> x;
	for (int i = 0; i < 32; ++i) {
		if ((x & (1 << i)) != 0) {
			bitcount += 1;
		}
	}
	std::cout << bitcount;
	return 0;
}