import java.util.Scanner;

public class No47 {

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        int biscuits = s.nextInt();
        int current = 1;
        int tapped = 0;
        while (current < biscuits) {
            current *= 2;
            tapped++;
        }
        System.out.println(tapped);
    }
}