What is the sum of interest expense and income tax expense under the ASC 605 Historical Adjusted Balances?
{"Operating revenue": {"Reported Balances": 23443.0, "Impact of ASC 606": 39.0, "ASC 605 Historical Adjusted Balances": 23482.0}, "Cost of services and products (exclusive of depreciation and amortization)": {"Reported Balances": 10862.0, "Impact of ASC 606": 22.0, "ASC 605 Historical Adjusted Balances": 10884.0}, "Selling,general and administrative": {"Reported Balances": 4165.0, "Impact of ASC 606": 71.0, "ASC 605 Historical Adjusted Balances": 4236.0}, "Interest expense": {"Reported Balances": 2177.0, "Impact of ASC 606": -9.0, "ASC 605 Historical Adjusted Balances": 2168.0}, "Income tax expense": {"Reported Balances": 170.0, "Impact of ASC 606": -12.0, "ASC 605 Historical Adjusted Balances": 158.0}, "Net loss": {"Reported Balances": -1733.0, "Impact of ASC 606": -33.0, "ASC 605 Historical Adjusted Balances": -1766.0}, "BASIC AND DILUTED LOSS PER COMMON SHARE -- BASIC": {"Reported Balances": -1.63, "Impact of ASC 606": -0.03, "ASC 605 Historical Adjusted Balances": -1.66}, "BASIC AND DILUTED LOSS PER COMMON SHARE -- DILUTED": {"Reported Balances": -1.63, "Impact of ASC 606": -0.03, "ASC 605 Historical Adjusted Balances": -1.66}, "WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING -- BASIC": {"Reported Balances": 1065866.0, "Impact of ASC 606": "-", "ASC 605 Historical Adjusted Balances": 1065866.0}, "WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING -- DILUTED": {"Reported Balances": 1065866.0, "Impact of ASC 606": "-", "ASC 605 Historical Adjusted Balances": 1065866.0}}
interest_expense = df["Interest expense"]["ASC 605 Historical Adjusted Balances"]
income_tax_expense = df["Income tax expense"]["ASC 605 Historical Adjusted Balances"]
answer = interest_expense + income_tax_expense