Neurons

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Neurons
{
    class Program
    {
        static void Main(string[] args)
        {
            StringBuilder result = new StringBuilder();
            string input = Console.ReadLine();
            while (input != "-1")
            {
                uint num = uint.Parse(input);
                char[] bin = Convert.ToString(num, 2).PadLeft(32, '0').ToCharArray();
                int left = 0;
                int right = 0;
                for (int i = 0; i < 32; i++)
                {
                    if (bin[i] == '1')
                    {
                        left = i;
                        break;
                    }
                }
                for (int i = 31; i >= 0; i--)
                {
                    if (bin[i] == '1')
                    {
                        right = i;
                        break;
                    }
                }

                for (int i = 0; i < left; i++)
                {
                    bin[i] = '1';
                }
                for (int i = 31; i > right; i--)
                {
                    bin[i] = '1';
                }

                if (left == 0 && right == 0)
                {
                    for (int i = 0; i < 32; i++)
                    {
                        bin[i] = '1';
                    }
                }

                num = Convert.ToUInt32(new string(bin), 2);
                num = ~num;
                result.AppendLine(num.ToString());

                input = Console.ReadLine();
            }

            Console.WriteLine(result);
        }
    }
}