public static void Main()
Console.WriteLine("Start algoritm");
Console.WriteLine("Input a = ");
A = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Value A cannot be less than 0");
Console.WriteLine("Input b = ");
B = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Value B cannot be less than 0");
Console.WriteLine("Square = " + S);
Console.WriteLine("Stop algoritm");