import java.util.Scanner;

public class Main {
	public static void main(String... args) {
		Scanner sc = new Scanner(System.in);

		int biscuitsQty = sc.nextInt();
		System.out.println(calcHitPocket(biscuitsQty));
	}

	public static int calcHitPocket(final int biscuitsQty) {
		int hitQty = 0;
		int currentBiscuitsQty = 1;

		while (currentBiscuitsQty < biscuitsQty) {
			currentBiscuitsQty *= 2;
			hitQty++;
		}
		return hitQty;
	}
}