2.ListLab

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

namespace SumAdjacentEqualNumbers
{
    class Program
    {
        static void Main()
        {
            List<decimal> numbers = Console.ReadLine()
                .Split(' ')
                .Select(decimal.Parse)
                .ToList();

            for (int i = 0; i < numbers.Count-1; i++)
            {
                decimal currentNumber = numbers[i];
                decimal nextNumber = numbers[i + 1];

                if(currentNumber == nextNumber)
                {
                    numbers[i] += numbers[i + 1] ;
                    numbers.Remove(numbers[i + 1]);
                    i = -1;
                }
            }
            Console.WriteLine(string.Join(" ", numbers));
        }
    }
}