Using awk to summarize data and sort output then sum result of a column

Question

LOGFILE\'s Raw Data:

   Data1 12:00 Sep 28 COUNT= 100
   Data1 12:00 Sep 30 COUNT= 8
   Data1 12:00 Oct 02 COUNT= 4
   Data1 12:00 Oct 01 COUNT= 3
   Data1 12