Read this article : https://www.mdpi.com/2227-7390/8/10/1645 in this para 3. A Small Subgroup Attack
i cant understand 18 million above privatekey 

please any one read this article paragraph 3. A Small Subgroup Attack make python code

i need this adderss privatekey
Uncompressed Address
1B5USZh6fc2hvw2yW9YaVF75sJLcLQ4wCt
Public Key (hex) 04c994b69768832bcbff5e9ab39ae8d1d3763bbf1e531bed98fe51de5ee84f50fb483ada7726a3c 4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8

if you know the private key send me please thinkeasy123@protonmail.com