implementing interface??

class Program
    {
        interface math
        {
            void odd();
            void even();
        }
        class test : math
        {
            void math.odd()
            {
Console.WriteLine("number is odd");
            }
            void math.even()
            {
Console.WriteLine("number is odd");
            }
         public void sort(math ob)
            {
                Console.WriteLine("enter number");
                int n = Convert.ToInt32(Console.ReadLine());
                if( n%2==0)
                Console.WriteLine("number is even");
                else
                Console.WriteLine("number is odd");
            }
        }
        static void Main(string[] args)
        {
            math ob = new test();
            test ob1=new test();
            ob1.sort(ob);

            Console.ReadKey();
        }
    }