import java.util.Scanner;

class Question047
{
	public static void main(String[] args)
	{
	
		Scanner scan = new Scanner(System.in);
		
		int n = scan.nextInt();
		int pow = 1;
		int cnt = 0;
		for(cnt=0; pow<n; cnt++){
			pow = pow * 2;
		}
		
		System.out.println(cnt);		
	}
}