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(true)
        {
            if (count >= N)
            {
                System.Console.WriteLine(x);
                return;
            }
            count = count * 2;

            x++;
        }
        
    }
}