#include<stdio.h>
#include<iostream>
using namespace std;

int main()
{
	int N,i,j;
	cin >> N;
	i = 0;
	j = 0;
	while (N > 1)
	{
		if (N % 2 == 0)
		{
			N = N / 2;
		}
		else
		{
			N = (N - 1) / 2;
			j++;
		}
		i++;
	}
	if (j == 0)
	{
		cout << i;
	}
	else
	{
		cout << i + 1;
	}
	return 0;
}