public static void Main()
const char SYMBOL = '\u00A9';
Console.Write("Please enter the same positive number: ");
while (!int.TryParse(Console.ReadLine(), out lines) || lines <= 0) Console.WriteLine("Invalid number!!!");
string firstLine = new string(' ', lines - 1) + SYMBOL;
Console.WriteLine(firstLine);
for (int i = 2, left = lines - 2, right = 1; i < lines * 2; i++)
Console.WriteLine(new string(' ', left) + SYMBOL + new string(' ', right) + SYMBOL);
Console.Write(SYMBOL + " ");