import java.util.Scanner;
import java.util.InputMismatchException;

public class TwoTimesBiscuits {
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        try{
            int N = scanner.nextInt();
            if(N < 1 || N > Math.pow(10, 8)){
                System.out.println("Nは1以上10の8乗以下で入力してください");
                System.exit(0);
            }
            
            int Count = 0;
            int Pocket = 1;
            
            while(Pocket < N){
                Pocket *= 2;
                Count++;
            }
            System.out.println(Count);
            
        }catch(InputMismatchException e){
            System.out.println("数字を入力してください");
        }catch(Exception E){
            System.out.println("想定外のエラーです");
        }
    }
}