static void Main(string[] args)
{
BadParent a = new BadParent();
BadChildren b = new BadChildren();
GoodParent c = new GoodParent();
GoodChildren d = new GoodChildren();
Test(a);
Test(b);
Test2(c);
Test2(d);
Console.ReadKey();
}
static void Test(BadParent t)
{
Console.WriteLine(t.Divide(5, 2));
}