help to calculate EBITDA.

calculating method:

-starting with operating income,

add back , special charges from expenses (this is more art than science, but charges that will not occure every year. * one time non-recuring expense need add back example as litigation expenses, leasehold improvemnts, start up of a new compus, or other special expenses that would not occur in the future.

1. occupancy , other restaurant operating cost,general and administration,pre-openning expenses, impairement costs... listed in expenses... need to clearly which are one special charges or non-recuring expense .. (here should be careful)

then ,add depreciation and amortization..

Please help to calculate 2013 to 2015's EBITDA. also following are potbelly restaurent income statements.

(In thousands) 2014 Restaurant Revenue Total Revenue 2013 S298,574 $298,574 2015 S325,464$370,954 S325,464S370,954 Cost of Sales Labor Occupancy Other Restaurant Operating Costs General and administrative Pre-opening expenses Depreciation and Amortization One time restaurant impairment charges (non- cash) $87,380 $83,579 $36,394 $30,781 $39,656 $1,437 $17,875 $93,688$105,614 $93,165$106,628 $46,762 $39,869 S32,420 $37,322 $2,160 $21,476 $41,389 $34,669 $1,634 $19,615 $1,135 $298,237 $3,589 S319,708S363,420 $3,128 Total Expenses Operating income Other income (expense), net $337 $5,756 $7,534 Interest expense $387 $179 $221 Income before income taxes Provision (benefit) for income taxes Net (Loss) Income (S50) ($204) $154 S5,577 $2,748 $2,829 $7,313 $3,466 $3,847