What is the total allowances for doubtful accounts in 2018 and 2019?
{"Gross Accounts Receivable - Trade": {"2018": 300016, "2019": 273053}, "Less -- Allowances for doubtful accounts": {"2018": 1893, "2019": 1276}, "Less -- Stock rotation and ship from stock and debit": {"2018": 15989, "2019": 14140}, "Less -- Sales returns and discounts": {"2018": 6875, "2019": 646}, "Less -- Total allowances": {"2018": 24757, "2019": 16062}, "Less -- Accounts Receivable - Trade, net": {"2018": 275259, "2019": 256991}}
doubtful_allowance_2018 = df["Less -- Allowances for doubtful accounts"]["2018"]
doubtful_allowance_2019 = df["Less -- Allowances for doubtful accounts"]["2019"]
answer = doubtful_allowance_2018 + doubtful_allowance_2019