How to count the Number of Nodes with same innertext value in XML

I am working on a C# code. I have my XML document with with different nodes, Out of which I need to count the number of nodes having the same innertext value. I am Using XmlDocument. Let's say I have a xml file where I have to count the number of nodes having InnerText value BSS.

Code:

<Annotations>
 <Objects>
  <ObjectId>BSS</ObjectId>
  <ObjectId>CAT</ObjectId>
 </Objects>
<Objects>
  <ObjectId>BSS</ObjectId>
  <ObjectId>ABC</ObjectId>
 </Objects>
<Objects>
  <ObjectId>BSS</ObjectId>
  <ObjectId>PCT</ObjectId>
 </Objects>
<Annotations>

Here in the Above code I want to count the number of nodes having innertext value BSS.like here the count should be 3.Your help will be greatly appreciated.