import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		int biscuitAmount = 1;
		int bisucuitCount = 0;

		while(biscuitAmount < N){
			biscuitAmount *= 2;
			bisucuitCount++;
		}

		System.out.println(bisucuitCount);
		scan.close();
	}

}