#include <iostream>
#include <limits>
using namespace std;

int calculate(unsigned int a)
{
	int count = 0;
	while(a != 0)
	{
		if((a & 0x1) != 0) ++count;
		a >>= 1;
	}
	return count;
}

int main() {
	// your code goes here
	std::cout << calculate(10) << std::endl;
	std::cout << calculate(7) << std::endl;
	return 0;
}