public static void Main(string[] args)
Console.WriteLine(10 + 20);
Console.WriteLine(-1 + 24);
Console.WriteLine(14 - (24 / 11));
Console.WriteLine("Center calculator");
Console.WriteLine("____________________");
Console.WriteLine("|Press 1:Add |");
Console.WriteLine("|Press 2:Sub |");
Console.WriteLine("|Press 3:Div |");
Console.WriteLine("|Press 4:Mul |");
Console.WriteLine("| |");
Console.WriteLine("| |");
Console.WriteLine("____________________");