Distinct members in parent child hierarchy

Hi I have got parent child hierarchy set up on a cube in one of my projects.Now i have a requirement to show distinct objects in that hierarchy i.e distinct parent + distinct child can some one help me for MDX that i can use for calculated measure to give me desired result?I tried using Descendants function in calculated measure But i don't get count of parent and childs in parent-child hierarchy SUM(Descendants([SQL Dependency].[SQL Dependency Hierarchy].CurrentMember , 0, SELF_AND_AFTER), [Measures].[Object Instance Count] )Just go summarize the requirement i need to get distinct object in my parent child hierarchy:e.g M1 -> E1 ->E2 i need to get 3