import java.util.Scanner;

public class No47 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();

        int result = doHit(1, n, 0);
        System.out.println(result);

        sc.close();
    }

    private static int doHit(int biskets, int want, int hitHnt) {
        if (biskets >= want) {
            return hitHnt;
        }

        hitHnt++;

        return doHit(biskets * 2, want, hitHnt);
    }

}