I need to find out what the days cash on hands ratio is. I know the formula is

(Cash + Marketable securities + Long term investments) / ( (Operating expenses - Depreciation and amortization expenses)/365)

But I dont know what the long term investment would be for this balance sheet. Could you explain what I would put for the long term investment number.

ASSETS 2016 2015 Current assets Cash and cash equivalents Patient accounts receivable, net of allowance for doubtful 20,980,469 $ accounts of $8,244,223 in 2016 and $7,957,642 in 2015 Inventories Prepaid expenses and other current assets Estimated third-party payor settlements Other assets current portion 12,121,632 2,464,740 1,954,972 80,000 12,214,616 2,580,826 1,649,618 424,309 33,477,041 85,108,293 24,956,955 7,111,820 250,654,109 Total current assets Assets whose use is limited Property and equipment, net Other assets, net of current portion 37,935,325 97,587,760 115,550,461 7.463,899 258,537.445 Total assets LIABILITIES AND NET ASSETS Current liabilities Accounts payable Accrued personnel costs Accrued expenses Estimated third-party payor settlements Current portion of obligations under capital leases Current portion of long-term debt 2,507,682 6,874,654 2,147,539 765,000 343,719 1,430,000 14,068,594 ,919,074 $ 6,885,365 2,306,195 -0 478,049 1,495,000 13,083,683 Total current liabilities ASSETS 2016 2015 Current assets Cash and cash equivalents Patient accounts receivable, net of allowance for doubtful 20,980,469 $ accounts of $8,244,223 in 2016 and $7,957,642 in 2015 Inventories Prepaid expenses and other current assets Estimated third-party payor settlements Other assets current portion 12,121,632 2,464,740 1,954,972 80,000 12,214,616 2,580,826 1,649,618 424,309 33,477,041 85,108,293 24,956,955 7,111,820 250,654,109 Total current assets Assets whose use is limited Property and equipment, net Other assets, net of current portion 37,935,325 97,587,760 115,550,461 7.463,899 258,537.445 Total assets LIABILITIES AND NET ASSETS Current liabilities Accounts payable Accrued personnel costs Accrued expenses Estimated third-party payor settlements Current portion of obligations under capital leases Current portion of long-term debt 2,507,682 6,874,654 2,147,539 765,000 343,719 1,430,000 14,068,594 ,919,074 $ 6,885,365 2,306,195 -0 478,049 1,495,000 13,083,683 Total current liabilities