Cheng 1 = 0
Cheng 2 = 256
Cheng 3 = 512
Cheng 4 = 768
Cheng 5 = 1024
Cheng 6 = 1280
Cheng 7 = 1536
Cheng 8 = 1792
Cheng 9 = 2048
Cheng 10 = 2304
Cheng 11 = 2560**
Cheng 12 = 2816 or 3000**