We are standing on the top of a 336 feet tall building and launch a small object upward. The object's vertical position, measured in feet, after t seconds is `h(t) = -16t^2+320t+336`.   What is the highest point that the object reaches?

feet

Box 1: Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172
Enter DNE for Does Not Exist, oo for Infinity