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

namespace ConsoleApp7
{
    class Program
    {
        static void Main(string[] args)
        {


            List<decimal> numbers = Console.ReadLine().Split().Select(decimal.Parse).ToList();


            for (int i = 0; i < numbers.Count - 1; i++)
            {

                if (numbers[i] == numbers[i + 1])
                {
                    numbers[i] = numbers[i] + numbers[i + 1];
                    numbers.RemoveAt(i + 1);
                    i = -1;

                }


            }

            Console.WriteLine(String.Join(" ", numbers));




        }
    }
}