public class Hello
{
    public static void Main()
    {
        string line = System.Console.ReadLine().Trim();
        int N = int.Parse(line);

        int count = 1;
        int x = 0;
        while(count >= N)
        {       
            count = count * 2;
            x++;
        }
        System.Console.WriteLine(x);
        return;
        
    }
}