Beolvaso

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<int> numbers = new List<int>();
        int input;
        int sum = 0;

        while (true)
        {
            Console.Write("Enter a number (0 to calculate sum): ");
            if (int.TryParse(Console.ReadLine(), out input))
            {
                numbers.Add(input);
                sum += input;
                if (input == 0)
                {
                    Console.WriteLine("Sum of previous numbers: " + sum);
                    break;
                }
            }
            else
            {
                Console.WriteLine("Invalid input. Please enter a valid number.");
            }
        }
    }
}