Storage Analysis: PV Count in a VG

A volume group is nearly full and you're planning to extend it. First, how many physical volumes does it already contain? /root/storage/task.txt names the VG (it differs per session); a capture of pvs is at /root/storage/pvs.txt. Count the PVs whose VG column is exactly that name — the capture also lists a look-alike VG and an unassigned PV — and record the number to /root/answers/pv_count.txt.