with each hotfix deplyed by msft the versión number changes
for NAV 2013 R2 starts with 7.1 and with NAV 2013 starts with 7.0
the last 5 digits means the build, in 2013 the last build is 36076 so the complete bulid number is 7.0.36076.0
if you want to check the build list created by the hotfixes you should go to mbs.microsoft.com/.../NAV2013AppHotfixOverview
you need to login to the partner soource to see the link