Upvote:2
Yes you can. It is valid for three months. Any number of entries after 16-03-18 inclusive but before 16-06-18 inclusive, into any Schengen states.
You have to exit Schengen area by the end of the day on 16-06-18, and you can stay no more than 30 days total. I.e. if you spent all your days you can't enter or stay anymore, even if visa is still valid date-wise.
To be on a safe side, count every time you entered as a separate day, even if you did multiple entries in one day.