What is the summed Total current income tax expense for the fiscal years 2017, 2018 and 2019?
{"Current: -- Federal": {"March 29, 2019": 73, "March 30, 2018": 1011, "March 31, 2017": 108}, "Current: -- State": {"March 29, 2019": 15, "March 30, 2018": 40, "March 31, 2017": 6}, "Current: -- International": {"March 29, 2019": 74, "March 30, 2018": 107, "March 31, 2017": 68}, "Current: -- Total": {"March 29, 2019": 162, "March 30, 2018": 1158, "March 31, 2017": 182}, "Deferred: -- Federal": {"March 29, 2019": -52, "March 30, 2018": -1664, "March 31, 2017": -177}, "Deferred: -- State": {"March 29, 2019": -2, "March 30, 2018": -151, "March 31, 2017": -17}, "Deferred: -- International": {"March 29, 2019": -16, "March 30, 2018": -33, "March 31, 2017": -14}, "Deferred: -- Total": {"March 29, 2019": -70, "March 30, 2018": -1848, "March 31, 2017": -208}, "Deferred: -- Income tax expense (benefit)": {"March 29, 2019": 92, "March 30, 2018": -690, "March 31, 2017": -26}}
total_2019 = df["Current: -- Total"]["March 29, 2019"]
total_2018 = df["Current: -- Total"]["March 30, 2018"]
total_2017 = df["Current: -- Total"]["March 31, 2017"]
answer = total_2019 + total_2018 + total_2017