Find the sum of the first $$30$$ terms of the following sequence.  $$1$$，$$2$$，$$2$$，$$3$$，$$3$$，$$3$$，$$4$$，$$4$$，$$4$$，$$4$$，$$5$$，$$5$$，$$5$$，$$5$$，$$5$$，$$\cdots \cdots $$ 
Overseas Competition->Knowledge Point->Calculation Modules->Sequences and Number Tables->Arithmetic Sequences->Sum of Terms in Arithmetic Sequences