import java.util.Scanner;

public class WonderPocket {

    public static void main(String[] args) {
        
        Scanner scanner = new Scanner(System.in);
        
        int n = scanner.nextInt();
        
        int bis = 1;
        
        int count = 0;
        
        //オーバーしない数まで二倍していく
        while((bis *= 2) <= n){
            
            count++;
                    
        }
        
        if(bis/2 == n){
            System.out.println(count);
        }else{
            count++;
            System.out.println(count);
        }
        
    }
}