10.2.2

import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Scanner;

/**
 * Created by Сергей on 27.05.2016.
 */
public class Sol {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        int n, m=0;
        n = sc.nextInt();

        while (n>2)
        {
            if (n%2==0) {
                n=n/2;
            }
            else {
                n=n/2+1;
            }
            m++;
        }
        System.out.println(m+1);
    }
}