If anyone is interested - new blockchain was started with 18.446.744 coins with 9.200.000 premine which is almost 50% 
https://github.com/pyrex-coin/Pyrex/commit/8077ddf65e4beb4f118d8023e275bb3665a06c8a
https://github.com/pyrex-coin/Pyrex/commit/8077ddf65e4beb4f118d8023e275bb3665a06c8a
Code:
const uint64_t premine = 9200000000000000000U;
https://github.com/pyrex-coin/Pyrex/blob/master/src/cryptonote_config.hCode:
#define COIN ((uint64_t)1000000000000) // pow(10, 12)