import java.util.Arrays;
import java.util.LinkedList;
import java.util.Scanner;

public class Main {
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final int N = sc.nextInt();
		
		System.out.println(Integer.numberOfTrailingZeros(Integer.highestOneBit(N)) + (Integer.highestOneBit(N) != N ? 1 : 0));
	}
	
}