import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;
import java.math.*;
 
public class Main {
	public static void main(String[] args)throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb = new StringBuilder();
		int n = Integer.parseInt(br.readLine());
		int sum = 1;
		int cnt = 0;
		while(true){
			if(sum>=n)break;
			sum *= 2;
			cnt++;
		}
		sb.append(cnt);
		System.out.println(sb);
	}
}