import java.util.Scanner;
import java.lang.Math;
import java.lang.StringBuilder;
import java.util.regex.Pattern;

    public class Main {
        public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            
            int n = sc.nextInt();
            int m = 1;
            int ans = 0;
            for(int i=0; m<n; i++){
                m *= 2;
                ans++;
            }
            System.out.println(ans);
        }
    }