using System;

public class Program
{
	public static void Main()
	{
		int N = int.Parse(Console.ReadLine());
		var isUsed = new bool[N];
		isUsed[0] = true;
		for (int i = 1; i < N; i++)
		{
			isUsed[i] = false;
		}
		int ans = 1;
		int current = 1;
		while (current != N)
		{
			int move = 0;
			for (int temp = current; temp > 0; temp /= 2)
			{
				move += temp % 2;
			}
			if (current + move <= N && !isUsed[current + move - 1])
			{
				++ans;
				isUsed[(current += move) - 1] = true;
			}
			else if (current - move < 0 || isUsed[current - move - 1])
			{
				Console.WriteLine(-1);
				return;
			}
			else
			{
				++ans;
				isUsed[(current -= move) - 1] = true;
			}
		}
		Console.WriteLine(ans);
	}
}