using System.Numerics;

public class Program
{
    public static void Main()
    {

        //BigInteger num = BigInteger.Parse(Console.ReadLine() ?? string.Empty);
        int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] moji = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        //string str = Console.ReadLine() ?? string.Empty;

        int count = 1;
        int math = 1;

        int numnum = math;
        for(int i = 0;i <= num;i++)
        {
            count++;

            string nn = Convert.ToString(math, 2);
            nn = nn.Replace("0", "");
            if(nn.Length >= num+1)
            {
                Console.WriteLine(-1);
            }
            if(math + nn.Length == num)
            {
                Console.WriteLine(count);
                return;
            }
            if(math + nn.Length > num)
            {
                if (math -nn.Length == numnum||math-nn.Length <= 0)
                {
                    Console.WriteLine(-1);
                    return;
                }
                numnum = math;
                math-=nn.Length;
            }
            else
            {
                numnum = math;
                math += nn.Length;
            }

        }
        Console.WriteLine(-1);

    }
}