import java.util.*;
import java.lang.*;
import java.io.*;

class Main
{
	public static void main (String[] args) 
	{
		// 入力値の読み込み
		Scanner sc = new Scanner(System.in);
		int  d = sc.nextInt();
		int count=0;
		int n =1;
		
		while(n < d){
		n = n*2;
		count += 1;
		}
		
		
		System.out.println(count +1);
	}
}