What is the total balance at the beginning of the period in fiscal year 2018 and 2019?
{"Allowance for Doubtful Accounts: -- Fiscal Year 2019": {"Balance at Beginning of Period": "$\u2014", "Charged to Costs and Expenses": "$\u2014", "Write-offs": 5, "Balance at End of Period": "$\u2014"}, "Allowance for Doubtful Accounts: -- Fiscal Year 2018": {"Balance at Beginning of Period": "$\u2014", "Charged to Costs and Expenses": "$\u2014", "Write-offs": "$\u2014", "Balance at End of Period": "$\u2014"}, "Allowance for Doubtful Accounts: -- Fiscal Year 2017": {"Balance at Beginning of Period": "$\u2014", "Charged to Costs and Expenses": "$\u2014", "Write-offs": "$\u2014", "Balance at End of Period": "$\u2014"}, "Allowance for Deferred Tax Assets: -- Fiscal Year 2019": {"Balance at Beginning of Period": 54913, "Charged to Costs and Expenses": 3227, "Write-offs": "$\u2014", "Balance at End of Period": 58140}, "Allowance for Deferred Tax Assets: -- Fiscal Year 2018": {"Balance at Beginning of Period": 55931, "Charged to Costs and Expenses": "$\u2014", "Write-offs": -1018, "Balance at End of Period": 54913}, "Allowance for Deferred Tax Assets: -- Fiscal Year 2017": {"Balance at Beginning of Period": 79150, "Charged to Costs and Expenses": "$\u2014", "Write-offs": -23219, "Balance at End of Period": 55931}}
balance_2018 = df["Allowance for Deferred Tax Assets: -- Fiscal Year 2018"]["Balance at Beginning of Period"]
balance_2019 = df["Allowance for Deferred Tax Assets: -- Fiscal Year 2019"]["Balance at Beginning of Period"]
answer = balance_2018 + balance_2019