What was the change in gross profit between May 2018 and August 2018?
{"Net revenue": {"August 31, 2018": 5771831.0, "May 31, 2018": 5436952.0, "February 28, 2018": 5301101.0, "November 30, 2017": 5585532.0}, "Gross profit(4)": {"August 31, 2018": 442147.0, "May 31, 2018": 398227.0, "February 28, 2018": 397133.0, "November 30, 2017": 469285.0}, "Operating income(1)(4)(5)": {"August 31, 2018": 153896.0, "May 31, 2018": 112971.0, "February 28, 2018": 129532.0, "November 30, 2017": 145754.0}, "Net (loss) income(2)(4)(5)": {"August 31, 2018": -56608.0, "May 31, 2018": 42702.0, "February 28, 2018": 37528.0, "November 30, 2017": 63919.0}, "Net (loss) income attributable to Jabil Inc.(2)(4)(5)": {"August 31, 2018": -57314.0, "May 31, 2018": 42541.0, "February 28, 2018": 37308.0, "November 30, 2017": 63795.0}, "(Loss) earnings per share attributable to the stockholders of Jabil Inc. -- Basic": {"August 31, 2018": -0.34, "May 31, 2018": 0.25, "February 28, 2018": 0.21, "November 30, 2017": 0.36}, "(Loss) earnings per share attributable to the stockholders of Jabil Inc. -- Diluted": {"August 31, 2018": -0.34, "May 31, 2018": 0.25, "February 28, 2018": 0.21, "November 30, 2017": 0.35}}
gross_profit_august = df["Gross profit(4)"]["August 31, 2018"]
gross_profit_may = df["Gross profit(4)"]["May 31, 2018"]
answer = gross_profit_august - gross_profit_may