What was the sum of the net revenues from the last two quarters?
{"Net revenues": {"July 28, 2017": 1321.0, "October 27, 2017": 1415.0, "January 26, 2018": 1539.0, "April 27, 2018": 1644.0}, "Gross profit": {"July 28, 2017": 824.0, "October 27, 2017": 900.0, "January 26, 2018": 956.0, "April 27, 2018": 1029.0}, "Provision for income taxes (1)": {"July 28, 2017": 14.0, "October 27, 2017": 48.0, "January 26, 2018": 983.0, "April 27, 2018": 38.0}, "Net income (loss)": {"July 28, 2017": 131.0, "October 27, 2017": 174.0, "January 26, 2018": -479.0, "April 27, 2018": 290.0}, "Net income (loss) per share, basic": {"July 28, 2017": 0.49, "October 27, 2017": 0.65, "January 26, 2018": -1.79, "April 27, 2018": 1.09}, "Net income (loss) per share, diluted": {"July 28, 2017": 0.47, "October 27, 2017": 0.63, "January 26, 2018": -1.79, "April 27, 2018": 1.06}}
net_revenues_january_26_2018 = df["Net revenues"]["January 26, 2018"]
net_revenues_april_27_2018 = df["Net revenues"]["April 27, 2018"]
answer = net_revenues_january_26_2018 + net_revenues_april_27_2018