using System;
using System.Linq;
using System.Collections.Generic;
namespace strong_number
{
    class Program
    {
        static void Main()
        {
            //Sum Adjacent Equal Numbers
            // 3 3 4 = 6 4
            // 3 3 6 4 = 6 6 4 = 12 4
            List<double> list = Console.ReadLine().Split(' ').Select(double.Parse).ToList();

            int occured = 0;
               
                while (true)
                {

                    for (int i=0; i< list.Count; i++)
                    if (i + 1 < list.Count)
                    {
                        if (list[i] == list[i + 1])
                        {
                            list[i] += list[i + 1];

                            list.RemoveAt(i + 1);
                            break;

                        }
                        else
                        {
                            occured++;
                            if (occured== list.Count - 1) { goto print; }
                        }
                    }
                occured = 0;
                }
           
                     
           print:
            Console.WriteLine(string.Join(" ", list));
        }
    }
}