import java.io.*;
import java.util.*;
import java.math.*;

class Main47 {
	
	public static void main (String[] args) throws IOException {
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		int n = Integer.parseInt(br.readLine());
		double d = Math.log(n) / Math.log(2);
		
		if (d == (int)d)
			System.out.println((int)d);
		else
			System.out.println((int)d + 1);
		
	}
}