#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int ruijo(int a, int max, int* pN)
{
	if (a*2 > max) return a;
	++ (*pN);
	return ruijo(a*2, max, pN);
}

int main(int argc, char**argv)
{
	int n;
	cin >> n;

	int num = 0;
	int max = ruijo(1, n, &num);
	if (n-max > 0) num ++;

	cout << num << endl;
	return 0;
}