using System;
namespace yukicoder_001 {
    class Program {
        static void Main(string[] args) {
            string NS = Console.ReadLine();
            int N = Int32.Parse(NS);
            Console.WriteLine(Count(N));//N渡して
        }

        static int pocket(int bis) {
            return bis * 2;
        }

        static int Count(int N) {
            int bis = 1;
            int i = 0;
            while (N > pocket(bis)) {
                bis = pocket(bis);
                i++;
            }
            int amari = N - bis;
            if (amari != 0) {
                if (amari % 2 == 0)
                    return i++;
                else
                    return i+=2;
            }
            return i;
        }
    }
}