Compiler Error in a DLL application

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C++/CLI

Hi,
I'm new to C++/CLI and I am getting compiler errors in a DLL appliction I am writing....

The DLL is passed in a text string from the calling application which needs to be cast to an unsigned int....

unsigned int^ pointParam = reinterpret_cast<unsigned int^>(dictParameters[POINT_PARAM]);

Then I am using the integer value to create an array of double values
but I need to increase the value by 2 so I thought I could add it in the array declaration statement...

sagXArray = gcnew array<double>(pointParam + 2);

I am getting the following compile error...

StrandedWireSag.cpp(42) : error C2676: binary '+' : 
'System::UInt32 ^' does not define this operator or a conversion 
to a type acceptable to the predefined operator

Why is the compiler unhappy about adding two values in a declaration?

Thanks