How to decode the tag id from IS41 Map parameter protocols specification

From MAP Parameters Signaling Protocols
if IMSI tag is
1 0 0 1 1 1 1 1
1 0 0 0 0 0 0 1
0 1 1 1 0 0 1 0

Decode
1 0 (CS) 0 (primitive) 1 1 1 1 1 ( tag > 31 )
1 (extension) 0 0 0 0 0 0 1
0 (no extention)1 1 1 0 0 1 0

So the value of IMSI tag will be 1 1 1 1 0 0 1 0 = 242