if((x != 40) || ( x != 30) || ( x != 15) || ( x != 0) || ( x != 60) || (y != 40) || ( y != 30) || (y != 15) || ( y != 0) || (y != 60)) Console.WriteLine("Illegal.."); else { if(x>y) Console.WriteLine(x-y); else Console.WriteLine(y-x);