public static void Main()
Console.WriteLine("Zadavej postupne cisla, ktera se maji secist (oddelena klavesou Enter), zadej nulu (0), kdyz budes chtit skoncit" + "\n");
bool isNumberOk1 = double.TryParse((Console.ReadLine()), out number1);
double result1 = number1;
while (!isNumberOk1 || number1 >= 0 || number1 < 0)
isNumberOk1 = double.TryParse((Console.ReadLine()), out number1);
result1 = result1 + number1;
result1 = result1 + number1;
Console.WriteLine("\n" + "Součet všech čísel je: " + result1 + "\n" + "Počet sečtených čísel je: " + numberCount1);