int distance = 0;
            int single = 0;
            int dec = 0;
            string text = "";
            string sEnd = " и ";


            Console.Write("Въведете разстояние в км: ");
            distance = int.Parse(Console.ReadLine());

            dec = distance / 10;
            single = distance - (dec * 10);

            if (dec != 0)
            {
                if (dec == 1)
                {
                    switch (distance)
                    {
                        case 10: text = text + "десет";
                            break;
                        case 11: text = text + "единадесет";
                            break;
                        case 12:
                            text = text + "дванадесет";
                            break;
                        case 13:
                            text = text + "тринадесет";
                            break;
                        case 14:
                            text = text + "четиринадесет";
                            break;
                        case 15:
                            text = text + "петнадесет";
                            break;
                        case 16:
                            text = text + "шестнадесет";
                            break;
                        case 17:
                            text = text + "седемнадесет";
                            break;
                        case 18:
                            text = text + "осемнадесет";
                            break;
                        case 19:
                            text = text + "деветнадесет";
                            break;
                        default:
                            break;
                    }
                }
                else 
                {
                    switch (dec)
                    {
                        case 2: text = text + "двадесет";
                            break;
                        case 3: text = text + "тридесет";
                            break;
                        case 4:
                            text = text + "четирдесет";
                            break;
                        case 5:
                            text = text + "петдесет";
                            break;
                        case 6:
                            text = text + "шестдесет";
                            break;
                        case 7:
                            text = text + "седемдесет";
                            break;
                        case 8:
                            text = text + "осемдесет";
                            break;
                        case 9:
                            text = text + "деветдесет";
                            break;

                        default:
                            break;
                    }
                }
            }
            

            if (distance < 10 || distance > 20)
            {

               if (distance > 20 && single != 0)
                {
                    text = text + sEnd;
                }

                switch (single)
                        {
                            case 1:
                                text = text + "един";
                                break;
                            case 2:
                                text = text + "два";
                                break;
                            case 3:
                                text = text + "три";
                                break;
                            case 4:
                                text = text + "четири";
                                break;
                            case 5:
                                text = text + "пет";
                                break;
                            case 6:
                                text = text + "шест";
                                break;
                            case 7:
                                text = text + "седем";
                                break;
                            case 8:
                                text = text + "осем";
                                break;
                            case 9:
                                text = text + "девет";
                                break;

                            default:
                                break;
                        }
            }
            

            Console.WriteLine(text + " км");