#include <iostream>

int main(void) {
	unsigned int N;
	std::cin >> N;
	unsigned int n = ~N;
	int i = 32;
	unsigned int a = 0;
	while((n >> --i) & 1);
	a = i;
	while(--i >= 0) a += (N >> i) & 1;
	std::cout << a << std::endl;
}