How many real numbers are not in the domain of the function
f(x) = 1/(x - 64) + 1/(x + 64) + 1/(x^2 - 64) + 1/(x^2 + 64) + 1/(x^3 - 64) + 1/(x^3 + 64) + 1/(x^4 - 64) + 1/(x^4 + 64)?
