import java.util.Scanner;

public class Main {
    public static void main(String[] p) {
        Scanner q = new Scanner(System.in);
        int n = q.nextInt();

        int i = 0;
        int a = 1;
        while (a < n) {
            i++;
            if (a <= n / 2) {
                a *= 2;
            } else {
                a += (n - a) * 2;
            }
        }
        System.out.println(i);
    }
}