;-)

using System;
using System.Collections.Generic;
using System.Linq;

namespace SumAdjacentEqualNumbers
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // double required,
            // decimal will give wrong result: 3.5 3.5 7 => 14.0
            List<double> numbers = Console.ReadLine()
                .Split(' ')
                .Select(double.Parse)
                .ToList();

            for (int i = 0; i < numbers.Count - 1; i++)
            {
                if (numbers[i] == numbers[i + 1])
                {
                    numbers[i] += numbers[i + 1];
                    numbers.RemoveAt(i + 1);
                    i = -1;
                }

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