Can't root Official CM13!

Hey guys currently I'm using Cyanogenmod 13 official! Few days back I flashed this ROM with TWRP 3.0.0.1 Recovery! The ROM is quite good but the main problem with this ROM is I can't root it! Whenever I flash the SuperSU zip from the recovery it flashes successfully but when my mobile boots up, my mobile stucks into the boot logo! And it keeps booting forever! How can I get rid of this problem!

Sorry for my Bad English! I hope you guys understood my problem!

Thanks in advance

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