#include <iostream>
#include <string>

int sumTatakuT( int n )
{
	if( n < 0 ){
		n = -n;
	}

	int distance = 0;
	bool exponent2 = true;
	while( ( n = n >> 1 ) > 0 ){
		++distance;
		if( n % 2 && n > 1 ){
			exponent2 = false;
		}
	}

	return (exponent2 ? distance : distance + 1);
}

int main()
{
	std::cout << "number : ";
	std::string strn;
	std::cin >> strn;
	int n = std::stoi( strn );
	std::cout << "  ans = " << sumTatakuT( n ) << "\n";
	return 0;
}