/*No.47 ポケットを叩くとビスケットが２倍*/
import java.util.*;
public class No47 {
	public static void main(String[] args) {
		try(Scanner input = new Scanner((System.in))){
			int want_eat=input.nextInt(),clap=0,work=want_eat;
			while(work>=2){
				work/=2;
				clap++;
			}
			if(want_eat!=Math.pow(2, clap)){
				clap++;
			}
			System.out.println(clap);
		}catch(Exception e){
			e.printStackTrace();
		}		
	}
}