C# MS ClearScript Add dynamic host objects

Question

I have a collection which I am exposing to a clearscript engine, at the moment I have to specify that the Value property is a static type int so that scripting basic arithmetic as plus or minus will work:

Here's my collection and the class it makes use of that I expose to the script engine:

public class LogicBlockIOCollection : ConcurrentDictionary<string, LogicBlockIO> { }

public class LogicBlockIO
{
    public string Name;
    public dynamic Value;
}

I am adding host objects to my clearscript egine using the following method:

public void AddBlock(LogicBlockIOCollection Entries)
{
    foreach (var Entry in Entries)
    {
        this[LastBlockID].Engine.Script[Entry.Key] = Entry.Value.Value;
    }
}

When I program the LogicBlockIO.Value property as dynamic and run the following script I receive these results:

C = A + B;
C = 1 + 2;
C = 12;  //Not 3 as expected

When I program the LogicBlockIO.Value property as integer, and I try to run the same simple script i get the results I expect:

   C = 3;

Does someone have a suggestion how it is possible to make use of a single property that may be of different types to achieve what I require?