Between 0 degrees Celsius and 30 degrees Celsius, the volume V (in cubic centimeters) of 1 kg of water at a temperature T is given approximately by the formula

$V = 999.87 - 0.06426 T + 0.0085043 T^2 - 0.0000679 T^3$

Find the temperature at which water has its maximum density.
Temperature = degrees Celsius