It's not a fixed amount, the voting determines the end supply. Once the mint phase ends (~10 days) there will be 53 million HVC. Limit phase starts and voting determines the supply during said phase and the duration of the phase is almost 3 months (~88.1 days). The max amount that can be added to the 53 million from the limit phase is almost 65 million and the least is 0. So you can have 53 million all the way up to 118 million after limit phase. Last phase sustain will add another 10 million at a rate no more than 8hvc/block.
The 65M stated on
http://heavycoin.github.io/ are incorrect as it misses the voting limit of 8 for the last 5 days of limit phase, which lowers the total amount of coins possible in limit phase by about 3.5M to ~61.5M.