#include <iostream>

int main(void)
{
	unsigned int num = 0;
	std::cin >> num;

	int cnt = 0;

	while(true)
	{
		num /= 2;

		if(num % 2 != 0) { num--; }

		cnt++;
		if(num <= 1) { break; }
	}

	std::cout << cnt << std::endl;

	return 0;
}