You cannot declare datatypes for a cluster. You can change your code to relentlessly use integer operations, including enclosing all of the constants in appropriate casting, like
X = X + int32(1);
Note: integer division A./B is defined to have the same result as cast(double(A)./double(B), class(A)) which might require a floating point unit.
To increase the number of cores in your profile see http://www.mathworks.com/matlabcentral/answers/125161-hyperthreading-number-of-cores-parallel-computing-toolbox
