import java.util.*;
public class main{
    public static void main(String[] args) {
        try{
            int a,b;
            float d;
            Scanner in=new Scanner(System.in);
            a=in.nextInt();
            d=(float)a;
            in.close();
            b=0;
            while(d>0.00001)
            {
            	b++;
            	d*=0.5;
            }
            System.out.print(b);
        }catch(Exception e){
            System.out.println("Input error!");
        }
    }
};