import java.util.*;

public class Main {
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int count=0;
        
        
        //nが2の累乗かどうかで判定(trueで2の累乗、falseなら違う)
        boolean checkNum=true;
        int num=n;
        while(num>1){
            if(num%2==1){
                checkNum=false;
                break;
            }
            num/=2;
        }

        while(n>1){
            n/=2;
            count++;
        }
        
        if(checkNum){
             System.out.println(count);
        }else{
             System.out.println(count+1);
        }

    }
}