import java.util.Scanner;

public class NickyEnMark {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		double n = scanner.nextDouble();
		int c = 0;
		while (n > 1) {
			n /= 2.0;
			c++;
		}

		System.out.println(c + 1);
	}
}