#include <iostream>
using namespace std;
int main()
{
	int k;
	cin >> k;
	int sum = 0,n = 0;
	float i = 1;
	while (sum < k)
	{
		sum += i;
		sum = sum;
		n++;
		i /= 2;
	}
	cout << n;
	return 0;
}