import java.util.Scanner;
public class Main {
	public static void main(String[] args){
		Scanner S = new Scanner(System.in);
		int N = S.nextInt();
		int x = 1;
		
		int i=0;
		for(i=0;x<N;i++){
			x*=2;
		}		

		System.out.println(i);
	}
}