using System;

class Q0047
{
	public static void Main()
	{
		int n = int.Parse(Console.ReadLine());

		int count = 0;
		int s = 1;
		for(; ; count++, s*= 2)
		{	
			if(s >= n)
			{
				break;
			}
		}

		Console.WriteLine(count);
	}
}