import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		Scanner scanner = new Scanner(System.in);
		int A = scanner.nextInt();
		int ans = 0;
		
		while(A/2 != 0){
			A = A/2;
			ans++;
		}
		
		System.out.println(ans+1);
		scanner.close();
	}
}