What is the total cash flow in operating activity  in 2018 and 2019?
{"Net cash provided by (used in): -- Operating activities": {"Fiscal 2019": 6627, "Fiscal 2018": 6027, "2019 to 2018 Change": 600}, "Net cash provided by (used in): -- Investing activities": {"Fiscal 2019": -1756, "Fiscal 2018": -1250, "2019 to 2018 Change": -506}, "Net cash provided by (used in): -- Financing activities": {"Fiscal 2019": -3767, "Fiscal 2018": -3709, "2019 to 2018 Change": -58}, "Net cash provided by (used in): -- Effect of exchange rate changes on cash and cash equivalents": {"Fiscal 2019": -39, "Fiscal 2018": -134, "2019 to 2018 Change": 95}, "Net cash provided by (used in): -- Net increase (decrease) in cash and cash equivalents": {"Fiscal 2019": 1065, "Fiscal 2018": 934, "2019 to 2018 Change": 131}}
total_cash_flow_2019 = df["Net cash provided by (used in): -- Operating activities"]["Fiscal 2019"]
total_cash_flow_2018 = df["Net cash provided by (used in): -- Operating activities"]["Fiscal 2018"]
answer = total_cash_flow_2019 + total_cash_flow_2018