import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner myScanner = new Scanner(System.in);
        int l = myScanner.nextInt();
        int d = 1;

        while (true) {
            l = (int) Math.floor((double) l / 2);
            d++;
            if (l == 1||l==0) {
                break;
            }
        }
        System.out.println(d);
    }
}