fixed

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

class SumAdjacentEqualNumbers
{
    static void Main()
    {
        List<double> numbers = new List<double>();
        string input = Console.ReadLine();
        List<string> list = input.Split(' ').ToList();
        for (int i = 0; i < list.Count; i++)
        {
            numbers.Add(double.Parse(list[i]));
        }
        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));
    }
}