Interface overriding in console apps

interface Interface
{
      void add(int x, int y);
}
class overrideinterface : Interface
{
      public void add(int a, int b)
      {
            Console.WriteLine("add is: " + (a + b));
      }
      public static void Main()
      {
            overrideinterface ovri = new overrideinterface();
            ovri.add(5, 5);
            Console.ReadLine();
      }
}

Note: A class can inherit any no.of interfaces separated by comma(,)