package yukicoder;

import java.util.Scanner;
import java.math.*;

public class N47 {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		double l = Math.log(n) / Math.log(2);
		if(l % 1.0 == 0){
			System.out.println((int) Math.round(l));
		}else{
			System.out.println((int) Math.floor(l) + 1);
		}
	}
}