import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.*;
public class Main {
    public static void main(String[] args) throws Exception {
        
         Scanner s = new Scanner(System.in);
        int X = s.nextInt();
       int num = 0;
		int i = 0;
		while(true){
			num = (int)Math.pow(2 , i);
			if(num >= X){
				System.out.println(i);
				break;
			}
			i++;
		}
    }
}