Appending line number to each line and getting total number of lines

Hello, I need help in appending the line number of each line to the file and also to get the total number of lines. Can somebody please help me.
I have a file say:
abc
def
ccc
ddd
ffff

The output should be:
Instance1=abc
Instance2=def
Instance3=ccc
Instance4=ddd
Instance5=ffff

Total number of Instances=5

Thanks,
Chiru

awk '{print "Instance"NR"="$0} END {print "Total number of Instances = "NR}' file

Thanks Shamrock, that works correctly..

-Chiru