Whats the total gain of CJ Premier 3 phono input?

I have a Conrad Johnson Premier 3 pre amplifier but I`m not sure whats the total gain when I use it`s phono input. CJ web site (http://www.conradjohnson.com/It_just_sounds_right/a-pr3.html) says that the phono stage has a 40 dB gain and the line stage has a 28 dB gain. Do I have to sum the two gains (since the "sound signal" will pass through both stages) to find out what`s the total gain when using the phono input?

So, what gain should I consider when choosing a cartridge to my TT, 40 or 68 dB?

Thank you very much and sory for the poor English (I`m from Brazil).

Pedro