using System;
using System.Collections.Generic;
using System.Linq;

public class MyLib {
    public static List<int> GetIntListFromTextReader(System.IO.TextReader reader, char delimitor) {
        return reader.ReadLine().Split( delimitor ).ToList<string>().ConvertAll<int>( int.Parse );
    }
    public static void WriteTextStream(System.IO.TextWriter writer, object args) {
        writer.WriteLine( args );
    }
}

public class Program {
    public static int Solver(int amount) {
        double d = Math.Log( (double)amount ) / Math.Log( 2 );
        return d - Math.Ceiling( d ) == 0 ? (int)d : (int)d + 1;
    }

    private static void Main() {
        var amount = int.Parse( Console.ReadLine() );
        Console.WriteLine( Solver( amount ) );
    }
}