import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		int n = sc.nextInt();
		int biscuit = 1;
		int times = 0;
		while (biscuit < n) {
			biscuit *= 2;
			times++;
		}
		System.out.println(times);
	}
}