Capital Stock or Additional Paid-in Capital???

Working on an s-corp balance sheet and I'm not sure if I'm entering Capital Stock and Additional Paid-In Capital correctly. This is for a 2nd year in business.  Let's say the beginning of year balances are (not sure if it matters there was a loss but I'll put it in just in case)...

 

capital stock   $20,000

additional paid-in capital   $0

retained earnings (loss)  -$10,000

 

And this year the two shareholders each put in an additional $5,000 in contributions to equity, not changing their 50/50 split. Should the end of year balance look like THIS (capital stock always staying the same as the first year stock purchased)...

 

capital stock   $20,000

additional paid-in capital   $10,000

 

Or does the capital stock number get increased to $30,000 and I leave add'l paid-in stock at $0? Or something else entirely?