using System;
class Program
{
    static void Main()
    {

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

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

        Console.WriteLine(string.Join(" ", input));

    }

}